52639 + Interview Questions in Secondary School in Chemistry

1.	Write a name of an element having variable valency.
Answer» Answer: List of elements having variable valency Explanation: Iron : → ferrous - Fe 2+ → FERRIC - Fe 3+ Copper : → cuprous - Cu + → CUPRIC - Cu 2+ Mercury. → mercurous - Hg + → MERCURIC - Hg 2+ Gold. → aurous - Au + → AURIC - Au 3+ Silver. → argentous - Ag + → ARGENTIC - Ag 2+ Lead. → plumbous - Pb 2+ → plumbic - Pb 4+ Platinum. → platinous - Pt 2+ → platinic - Pt 4+ Tin.

1.

Write a name of an element having variable valency.

Answer»

Answer:

List of elements having variable valency

Explanation:

Iron : → ferrous - Fe 2+ → FERRIC - Fe 3+

Copper : → cuprous - Cu + → CUPRIC - Cu 2+

Mercury. → mercurous - Hg + → MERCURIC - Hg 2+

Gold. → aurous - Au + → AURIC - Au 3+

Silver. → argentous - Ag + → ARGENTIC - Ag 2+

Lead. → plumbous - Pb 2+ → plumbic - Pb 4+

Platinum. → platinous - Pt 2+ → platinic - Pt 4+

Tin.

Discussion

2.	Question 1:The fraction of thermally excited atoms inFlame photometry is determined byequation
Answer» Answer: FLAME Emission Spectrophotometry Flame emission spectrophotometry is based on the characteristic emission of light by atoms of many metallic elements when GIVEN sufficient energy, such as that supplied by a hot flame. The wavelength to be used for the measurement of an element depends on the selection of a line of sufficient intensity to provide adequate sensitivity and freedom from other interfering lines at or near the selected wavelength. For example, lithium produces a red, sodium a yellow, POTASSIUM a violet, RUBIDIUM a red, and magnesium a blue color in a flame. These colors are characteristic of the metal atoms that are PRESENT as cations in solution. Under constant and controlled conditions, the light intensity of the characteristic wavelength produced by each of the atoms is directly proportional to the number of atoms that are emitting energy, which in turn is directly proportional to the concentration of the substance of interest in the sample. Although this technique once was used for the analysis of sodium, potassium, and lithium in body fluids, it has been replaced largely by electrochemical techniques.

2.

Question 1:The fraction of thermally excited atoms inFlame photometry is determined byequation

Answer»

Answer:

FLAME Emission Spectrophotometry

Flame emission spectrophotometry is based on the characteristic emission of light by atoms of many metallic elements when GIVEN sufficient energy, such as that supplied by a hot flame. The wavelength to be used for the measurement of an element depends on the selection of a line of sufficient intensity to provide adequate sensitivity and freedom from other interfering lines at or near the selected wavelength. For example, lithium produces a red, sodium a yellow, POTASSIUM a violet, RUBIDIUM a red, and magnesium a blue color in a flame. These colors are characteristic of the metal atoms that are PRESENT as cations in solution. Under constant and controlled conditions, the light intensity of the characteristic wavelength produced by each of the atoms is directly proportional to the number of atoms that are emitting energy, which in turn is directly proportional to the concentration of the substance of interest in the sample. Although this technique once was used for the analysis of sodium, potassium, and lithium in body fluids, it has been replaced largely by electrochemical techniques.

Discussion

3.	Discuss the formation of covalent bonds in molecules ofii. Ethylene
Answer» Answer: How many covalent bonds are there in a molecule of ethene? Ad by OPPO Mobile India Is the Oppo F17 Pro the sleekest phone of 2020? OPPO F17 Pro is the sleekest phone of the year in its CATEGORY. BOASTING of a 7.48mm ultra-thin and 164g ultra-lightweight body, Continue reading 25 Answers Alistair Garratt, former Looking for Work Answered March 20, 2017 Originally Answered: How many covalent bonds are there in a molecule of ethene ? In ethene, C2H4, THREE of the four electrons in the outer shell (2s2, 2p2) of each of the carbon atoms (1s2, 2s2,2p2) are sp2 hybridized, which RESULTS in one remaining outer 2p-orbital electron. The three sp2-hybridized electrons of each C-atom form three planar sigma-covalent bonds. Per ethene molecule, four of these sp2-hybridized orbitals (six in total as we have two C-atoms) form covalent sigma-bonds with the 1s electron of each hydrogen atom (4 H-atoms for two C-atoms) while the two remaining sp2 orbitals form a sigma bond connecting the two C-atoms. Explanation: Here is your answer Hope it was helpful

3.

Discuss the formation of covalent bonds in molecules ofii. Ethylene

Answer»

Answer:

How many covalent bonds are there in a molecule of ethene?

Ad by OPPO Mobile India

Is the Oppo F17 Pro the sleekest phone of 2020?

OPPO F17 Pro is the sleekest phone of the year in its CATEGORY. BOASTING of a 7.48mm ultra-thin and 164g ultra-lightweight body,

25 Answers

Alistair Garratt, former Looking for Work

Answered March 20, 2017

Originally Answered: How many covalent bonds are there in a molecule of ethene ?

In ethene, C2H4, THREE of the four electrons in the outer shell (2s2, 2p2) of each of the carbon atoms (1s2, 2s2,2p2) are sp2 hybridized, which RESULTS in one remaining outer 2p-orbital electron. The three sp2-hybridized electrons of each C-atom form three planar sigma-covalent bonds. Per ethene molecule, four of these sp2-hybridized orbitals (six in total as we have two C-atoms) form covalent sigma-bonds with the 1s electron of each hydrogen atom (4 H-atoms for two C-atoms) while the two remaining sp2 orbitals form a sigma bond connecting the two C-atoms.

Explanation:

Here is your answer

Hope it was helpful

Discussion

4.	Question 7 :The ratio -dl/dc gives the rate of decreaseof ------------- of radiation with concentrationof absorbing medium.
Answer» ANSWER: Explanation: QUESTION 7 : The ratio -dl/dc gives the rate of decrease of ------------- of radiation with concentration of absorbing medium. Hold on, our servers are SWAMPED. WAIT for your answer to fully load. Answer: Explanation: Question 7 : The ratio -dl/dc gives the rate of decrease of ------------- of radiation with concentration of absorbing medium.

4.

Question 7 :The ratio -dl/dc gives the rate of decreaseof ------------- of radiation with concentrationof absorbing medium.

Answer»

ANSWER:

Explanation:

QUESTION 7 :

The ratio -dl/dc gives the rate of decrease

of ------------- of radiation with concentration

of absorbing medium.

Hold on, our servers are SWAMPED. WAIT for your answer to fully load.

Answer:

Explanation:

Question 7 :

The ratio -dl/dc gives the rate of decrease

of ------------- of radiation with concentration

of absorbing medium.

Discussion

5.	what is a amount of heat to be supplied to a heat engine working between 95 °C and 15 °C.if it has to do a work of 850J?
Answer» ANSWER: TI is a good day at Work and SCHOOL is over the place where I am COMING now or later tonight if I don't WANT you so bad that I'm going to be a good day today with my family

5.

what is a amount of heat to be supplied to a heat engine working between 95 °C and 15 °C.if it has to do a work of 850J?

Answer»

ANSWER:

TI is a good day at Work and SCHOOL is over the place where I am COMING now or later tonight if I don't WANT you so bad that I'm going to be a good day today with my family

Discussion

6.	CH3-CHBr-CCliodine-CH2-Hname this compound by IUPAC rules ???plzzzzz...❤✔✅
Answer» ANSWER: THANK U for FREE POINTS

6.

CH3-CHBr-CCliodine-CH2-Hname this compound by IUPAC rules ???plzzzzz...❤✔✅

Answer»

ANSWER:

THANK U for FREE POINTS

Discussion

7.	Question 6:mixture provides highest flametemperature.
Answer» Explanation: Common FLAME temperatures The closest will be the hottest PART of a flame, where the COMBUSTION REACTION is most efficient. This also assumes complete combustion (e.g. perfectly balanced, non-smokey, USUALLY bluish flame).

7.

Question 6:mixture provides highest flametemperature.

Answer»

Explanation:

Common FLAME temperatures

The closest will be the hottest PART of a flame, where the COMBUSTION REACTION is most efficient. This also assumes complete combustion (e.g. perfectly balanced, non-smokey, USUALLY bluish flame).

Discussion

8.	Q. 18 Suggest a suitable method to separate Two volatile components withappreciable difference in boiling points.Your answer
Answer» Explanation: Method Simple DISTILLATION can be used to separate TWO volatile components with appreciable difference in boiling points. (c) Example MIXTURE of mustard OIL and water. Method Separating runnel is used to separate a mixture of immiscible liquids.

8.

Q. 18 Suggest a suitable method to separate Two volatile components withappreciable difference in boiling points.Your answer

Answer»

Explanation:

Method Simple DISTILLATION can be used to separate TWO volatile components with appreciable difference in boiling points. (c) Example MIXTURE of mustard OIL and water. Method Separating runnel is used to separate a mixture of immiscible liquids.

Discussion

9.	Find the total number of moles present in3 kg of ammonium nitrate?
Answer» Answer: 0.0375 moles Explanation: calculate no. of moles by formula MASS/MOLAR mass molar mass of ammonium NITRATE =80u ,GIVEN mass is 3kg 3/80 = 0.0375

9.

Find the total number of moles present in3 kg of ammonium nitrate?

Answer»

Answer:

0.0375 moles

Explanation:

calculate no. of moles by formula MASS/MOLAR mass

molar mass of ammonium NITRATE =80u ,GIVEN mass is 3kg

3/80 = 0.0375

Discussion

10.	Discuss the formation of covalent bonds in molecules ofi. Ammoniaii. Ethyleneiii. Carbon dioxide.
Answer» ANSWER: In ammonia (NH3), the nitrogen atom forms THREE covalent BONDS; one pair of ... Figure 2-3. In an ethylene MOLECULE, the carbon atoms are connected by a DOUBLE

10.

Discuss the formation of covalent bonds in molecules ofi. Ammoniaii. Ethyleneiii. Carbon dioxide.

Answer»

ANSWER:

In ammonia (NH3), the nitrogen atom forms THREE covalent BONDS; one pair of ... Figure 2-3. In an ethylene MOLECULE, the carbon atoms are connected by a DOUBLE

Discussion

11.	3.) Deline Moderan periodic law and discuss the differentblocks in the modem periodic table.
Answer» ANSWER: modern periodic law is is the physical and chemical properties of an element are periodic function of its atomic number. Blocks: wherever the valence electron is present will be defined as the block of an element. Ex. S block which contains two GROUPS that is is alkali metal and Alkali metal group. with max 2 valence electron in it's LAST shell. P block which contains group 13 to 18 D block that is TRANSITION elements F block that is inner transition metals

11.

3.) Deline Moderan periodic law and discuss the differentblocks in the modem periodic table.

Answer»

ANSWER:

modern periodic law is is the physical and chemical properties of an element are periodic function of its atomic number.

Blocks:

wherever the valence electron is present will be defined as the block of an element.

Ex.

S block which contains two GROUPS that is is alkali metal and Alkali metal group. with max 2 valence electron in it's LAST shell.

P block which contains group 13 to 18

D block that is TRANSITION elements

F block that is inner transition metals

Discussion

12.	6.What will be the external pressure at which watermay boil at 120°C?A. 1489 mm of Hg B. 790 mm of HgC. 700 mm of Hg D. 100 mm of Hg
Answer» ANSWER: SORRY PATA NHII hai Explanation: sorry

12.

6.What will be the external pressure at which watermay boil at 120°C?A. 1489 mm of Hg B. 790 mm of HgC. 700 mm of Hg D. 100 mm of Hg

Answer»

ANSWER:

SORRY PATA NHII hai

Explanation:

sorry

Discussion

13.	Na2o2 is used in the reaction that effect roll is known as.....
Answer» ANSWER: SODIUM peroxide Na2O2 Explanation: MARK it as BRAINLIEST PLZ

13.

Na2o2 is used in the reaction that effect roll is known as.....

Answer»

ANSWER:

SODIUM peroxide

Na2O2

Explanation:

MARK it as BRAINLIEST PLZ

Discussion

14.	Calculate the ratio of atoms present in 5 gram of magnesium and 5 gram of iron
Answer» EXPLANATION: the WEIGHT of the magnesium is 4gram and atomic MASS is 24 so number of atom =no.of.moles * AVOGADRO number. SIMILAR for iron so it is ratio is 4/24 * 56/4.

14.

Calculate the ratio of atoms present in 5 gram of magnesium and 5 gram of iron

Answer»

EXPLANATION:

the WEIGHT of the magnesium is 4gram and atomic MASS is 24 so number of atom =no.of.moles * AVOGADRO number.

SIMILAR for iron so it is ratio is 4/24 * 56/4.

Discussion

15.	18.5 why hydroxidee ions and bicarbonate ionscannot be. mixtogether
Answer» ANSWER: The possibility of OH-and HCO3- ions TOGETHER is ruled out because they COMBINE instantaneously to form CO32- ions. Thus OH-and HCO3- ions cannot exist together in water and hence can be concluded that all the three OH- , HCO3- ,CO32 ions cannot exist together [7,8]. Explanation: pls YAAR FOLLOW me guys pls

15.

18.5 why hydroxidee ions and bicarbonate ionscannot be. mixtogether

Answer»

ANSWER:

The possibility of OH-and HCO3- ions TOGETHER is ruled out because they COMBINE instantaneously to form CO32- ions. Thus OH-and HCO3- ions cannot exist together in water and hence can be concluded that all the three OH- , HCO3- ,CO32 ions cannot exist together [7,8].

Explanation:

pls YAAR FOLLOW me guys pls

Discussion

16.	If An element formsan oxide A2O3 which is acidic in nature Identify Aas a metal or nonnon metal. Justify
Answer» Answer: NON Metal. Explanation: GENERALLY non metals FORMS acidic oxides and metals form basic oxides. Eg:- MgO2,CaO2 etc are basic oxides , where Mg n Ca are metals. BO3(oxide of boron),NO3(oxide of nitrogen) etc are acidic oxides , where B and N are non metals. EXEPTIONS:- AlO3(oxide of ALUMINIUM), GaO3(oxide of galium) ,PbO n PbO2(oxides of lead), SNO2 n SnO( oxides of tin) are all amphoteric in nature.

16.

If An element formsan oxide A2O3 which is acidic in nature Identify Aas a metal or nonnon metal. Justify

Answer»

Answer:

NON Metal.

Explanation:

GENERALLY non metals FORMS acidic oxides and metals form basic oxides.

Eg:- MgO2,CaO2 etc are basic oxides , where Mg n Ca are metals.

BO3(oxide of boron),NO3(oxide of nitrogen) etc are acidic oxides , where B and N are non metals.

EXEPTIONS:- AlO3(oxide of ALUMINIUM), GaO3(oxide of galium) ,PbO n PbO2(oxides of lead), SNO2 n SnO( oxides of tin) are all amphoteric in nature.

Discussion

17.	And plz explain it
Answer» Formal Letter:- A letter which is GIVEN to MANAGER, principal etc. or to an office is called formal letter. Format:- \BEGIN{gathered}\begin{gathered}\boxed{\boxed{\begin{minipage}{5 cm}\sf{Sender's ADDRESS} \\ \\ \sf{Receiver's Address} \\ \\ \sf{Date}\\ \\ \sf{Salutation,}\\ \sf{.....Body.....}\\ \sf{..........}\\ \\ \sf{Complementary close}\\ \sf{Signature of sender}\end{minipage}}}\end{gathered}\end{gathered} INFORMAL Letter:- Letter given to close people -Relatives or friends. Format:- \begin{gathered}\begin{gathered}\boxed{\boxed{\begin{minipage}{5 cm} \sf{Sender's Address} \\ \\ \sf{Date} \\ \\ \sf{Salutation,}\\ \sf{.....Body.....}\\ \sf{..........}\\ \\ \sf{Complementary close}\\ \sf{Signature of sender}\end{minipage}}}\end{gathered}\end{gathered}

17.

And plz explain it

Answer»

Formal Letter:-

A letter which is GIVEN to MANAGER, principal etc. or to an office is called formal letter.

Format:-

\BEGIN{gathered}\begin{gathered}\boxed{\boxed{\begin{minipage}{5 cm}\sf{Sender's ADDRESS} \\ \\ \sf{Receiver's Address} \\ \\ \sf{Date}\\ \\ \sf{Salutation,}\\ \sf{.....Body.....}\\ \sf{..........}\\ \\ \sf{Complementary close}\\ \sf{Signature of sender}\end{minipage}}}\end{gathered}\end{gathered}

INFORMAL Letter:-

Letter given to close people -Relatives or friends.

Format:-

\begin{gathered}\begin{gathered}\boxed{\boxed{\begin{minipage}{5 cm} \sf{Sender's Address} \\ \\ \sf{Date} \\ \\ \sf{Salutation,}\\ \sf{.....Body.....}\\ \sf{..........}\\ \\ \sf{Complementary close}\\ \sf{Signature of sender}\end{minipage}}}\end{gathered}\end{gathered}

Discussion

18.	Question 10of the following element can not bedetected and estimated by flamephotometric technique.sodiumMagnesiumpotassiumoxygen
Answer» ANSWER: I THINK answer is POTASSIUM PLZZ FELLOW me

18.

Question 10of the following element can not bedetected and estimated by flamephotometric technique.sodiumMagnesiumpotassiumoxygen

Answer»

ANSWER:

I THINK answer is POTASSIUM

PLZZ FELLOW me

Discussion

19.	GURAV OMKAR HEMANTQuestion 1 :The fraction of thermally excited atoms inFlame photometry is determined byequation.Boltzmann distribution
Answer» Answer: Flame EMISSION Spectrophotometry Flame emission spectrophotometry is based on the characteristic emission of light by atoms of many metallic elements when given sufficient energy, such as that supplied by a hot flame. The wavelength to be used for the measurement of an element depends on the selection of a line of sufficient intensity to provide adequate sensitivity and freedom from other interfering lines at or near the selected wavelength. For example, lithium produces a red, sodium a YELLOW, potassium a violet, rubidium a red, and magnesium a blue color in a flame. These colors are characteristic of the metal atoms that are present as cations in solution. Under CONSTANT and controlled conditions, the light intensity of the characteristic wavelength produced by each of the atoms is directly proportional to the number of atoms that are emitting energy, which in turn is directly proportional to the concentration of the SUBSTANCE of interest in the sample. Although this technique once was used for the analysis of sodium, potassium, and lithium in body fluids, it has been replaced largely by electrochemical TECHNIQUES

19.

GURAV OMKAR HEMANTQuestion 1 :The fraction of thermally excited atoms inFlame photometry is determined byequation.Boltzmann distribution

Answer»

Answer:

Flame EMISSION Spectrophotometry

Flame emission spectrophotometry is based on the characteristic emission of light by atoms of many metallic elements when given sufficient energy, such as that supplied by a hot flame. The wavelength to be used for the measurement of an element depends on the selection of a line of sufficient intensity to provide adequate sensitivity and freedom from other interfering lines at or near the selected wavelength. For example, lithium produces a red, sodium a YELLOW, potassium a violet, rubidium a red, and magnesium a blue color in a flame. These colors are characteristic of the metal atoms that are present as cations in solution. Under CONSTANT and controlled conditions, the light intensity of the characteristic wavelength produced by each of the atoms is directly proportional to the number of atoms that are emitting energy, which in turn is directly proportional to the concentration of the SUBSTANCE of interest in the sample. Although this technique once was used for the analysis of sodium, potassium, and lithium in body fluids, it has been replaced largely by electrochemical TECHNIQUES

Discussion

20.	The addition of solid sodium carbonate to pure water causes__________ *
Answer» Answer: An increase in ph Explanation: SODIUM Carbonate is a salt of carbonic acid with an alkalinizing PROPERTY. When dissolved in water, sodium carbonate FORMS carbonic acid and sodium hydroxide. 2Na++CO32−+H2O⇌HCO3−+OH−+2Na+ You can see that the reaction produces OH− IONS and thus the solution becomes alkaline. The pH will increase. have a great DAY..

20.

The addition of solid sodium carbonate to pure water causes__________ *

Answer»

Answer:

An increase in ph

Explanation:

SODIUM Carbonate is a salt of carbonic acid with an alkalinizing PROPERTY. When dissolved in water, sodium carbonate FORMS carbonic acid and sodium hydroxide.

2Na++CO32−+H2O⇌HCO3−+OH−+2Na+

You can see that the reaction produces OH− IONS and thus the solution becomes alkaline.

The pH will increase.

have a great DAY..

Discussion

21.	Evaporation differs from boiling.ExplainPlease help me to solve this chemistry question answer
Answer» Answer: I HOPE this Ur answer and it is helps U Explanation: PLS MARK as BRAINLIEST

21.

Evaporation differs from boiling.ExplainPlease help me to solve this chemistry question answer

Answer»

Answer:

I HOPE this Ur answer and it is helps U

Explanation:

PLS MARK as BRAINLIEST

Discussion

22.	Pragya tested the solubility of three different substances at different temperaturesand collected the data as given below (results are given in the following table, asgrams of a substance dissolved in 100 grams of water to form a saturated solution).Substance dissolvedTemperature in K283293313333353SolubilityPotassium nitrate213262106167Sodium chloride36363737Potassium chloride36 35 243540465437415566Ammonium chlorideWhat mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water313k
Answer» ANSWER: yeahhhhhh........I ALSO had the same DOUBT

22.

Pragya tested the solubility of three different substances at different temperaturesand collected the data as given below (results are given in the following table, asgrams of a substance dissolved in 100 grams of water to form a saturated solution).Substance dissolvedTemperature in K283293313333353SolubilityPotassium nitrate213262106167Sodium chloride36363737Potassium chloride36 35 243540465437415566Ammonium chlorideWhat mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water313k

Answer»

ANSWER:

yeahhhhhh........I ALSO had the same DOUBT

Discussion

23.	According to the structure, the Cl atoms of bleachingpowder have oxidation numbersसंरचना के अनुसार विरंजक चूर्ण में C\| परमाणुओं के ऑक्सीकरणअंक हैंA0,0B0, -1+1, -1D0, +1
Answer» Answer: d Explanation: n TRIANGLE,AB=AC, AD PERPENDICULAR to BC. Prove AD bisect angle A and side BC

23.

According to the structure, the Cl atoms of bleachingpowder have oxidation numbersसंरचना के अनुसार विरंजक चूर्ण में C| परमाणुओं के ऑक्सीकरणअंक हैंA0,0B0, -1+1, -1D0, +1

Answer»

Answer:

d

Explanation:

n TRIANGLE,AB=AC, AD PERPENDICULAR to BC. Prove AD bisect angle A and side BC

Discussion

24.	Write a experiment of effect of heat an ice with aim, apparatus, observation and conlusion
Answer» Answer: we NEED a ICE aim APPARATUS Explanation: the ice will convert into aim please select the answer as brainlest answer we will observe that ice can be converted into aim

24.

Write a experiment of effect of heat an ice with aim, apparatus, observation and conlusion

Answer»

Answer:

we NEED a ICE aim APPARATUS

Explanation:

the ice will convert into aim

please select the answer as brainlest answer

we will observe that ice can be converted into aim

Discussion

25.	Khushi Kuch bolo yarr
Answer» ANSWER: cnncnfnfnfnfnfnnfnfnnffhfjhffjffhfuv rebddrb

25.

Khushi Kuch bolo yarr

Answer»

ANSWER:

cnncnfnfnfnfnfnnfnfnnffhfjhffjffhfuv rebddrb

Discussion

26.	भूत वालाsdjfhfdkßsidjdjhdjfhgjbfdkksksksjsddmdlkttypyp
Answer» ANSWER: what is this ??????????

26.

भूत वालाsdjfhfdkßsidjdjhdjfhgjbfdkksksksjsddmdlkttypyp

Answer»

ANSWER:

what is this ??????????

Discussion

27.	please don't spamno irrelevant stuffno guess class 12 question
Answer» ANSWER: your answer is OPTION 3 1.1x10^(-11)

27.

please don't spamno irrelevant stuffno guess class 12 question

Answer»

ANSWER:

your answer is OPTION 3

1.1x10^(-11)

Discussion

28.	किसी आवत में बाई और दाहिनी और बढ़ने पर संयोजकता पहले बढ़ती पुनः घटती है क्यों
Answer» Answer: KYA BHAI sjhe MAIN nhi aaya Explanation: ...........KH firm

28.

किसी आवत में बाई और दाहिनी और बढ़ने पर संयोजकता पहले बढ़ती पुनः घटती है क्यों

Answer»

Answer:

KYA BHAI sjhe MAIN nhi aaya

Explanation:

...........KH firm

Discussion

29.	A) Write the electronic configuration ofFe 3+, Cr 3+ , Mn2+ , Zn2+ (At No. of Fe-26 , Cr-24, Mn- 25, Zn- 30 )
Answer» Answer:all answers are MENTIONED below. Explanation: FE2+ [AR] 3d6 Cr3+ [Ar] 3d4 Mn2+ [Ar] 3d5 Zn2+ [A] 3D10

29.

A) Write the electronic configuration ofFe 3+, Cr 3+ , Mn2+ , Zn2+ (At No. of Fe-26 , Cr-24, Mn- 25, Zn- 30 )

Answer»

Answer:all answers are MENTIONED below.

Explanation:

FE2+ [AR] 3d6

Cr3+ [Ar] 3d4

Mn2+ [Ar] 3d5

Zn2+ [A] 3D10

Discussion

30.	Determine the volume of 12 gm hydrogen at 1.5 atmospheric pressure at 273°C
Answer» ANSWER: gjdgjsltsjlltsjltsustiltsuttjstisltilstsilstilysil

30.

Determine the volume of 12 gm hydrogen at 1.5 atmospheric pressure at 273°C

Answer»

ANSWER:

gjdgjsltsjlltsjltsustiltsuttjstisltilstsilstilysil

Discussion

31.	Chlorination of ethane in the presence of U. V. light followed by treatment with aq. NaOH gives_______ì
Answer» Answer: Think it's Benzoic acid. Explanation: Hope it will HELP you out please follow me and MARK my answer as brainliest answer

31.

Chlorination of ethane in the presence of U. V. light followed by treatment with aq. NaOH gives_______ì

Answer»

Answer:

Think it's Benzoic acid.

Explanation:

Hope it will HELP you out

please follow me and MARK my answer as brainliest answer

Discussion

32.	Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following; (04)a. A solid non- metal of valency 3.b. A gas of valency 2.c. A metal of valency 1.d. A non- metal of valency 4
Answer» Answer: MATCH the ATOMIC numbers 4, 14, 8, 15 and 19 with each of the following; (04) a. A solid non- metal of valency 3. b. A gas of valency 2. c. A metal of valency 1. d. A non- metal of valency 4

32.

Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following; (04)a. A solid non- metal of valency 3.b. A gas of valency 2.c. A metal of valency 1.d. A non- metal of valency 4

Answer»

Answer:

MATCH the ATOMIC numbers 4, 14, 8, 15 and 19 with each of the following; (04)

a. A solid non- metal of valency 3.

b. A gas of valency 2.

c. A metal of valency 1.

d. A non- metal of valency 4

Discussion

33.	Write the examples of odd electron molecule and expanded Octet molecule.
Answer» The bonding rules for molecules are GENERALLY applicable, but ... OCTET , (2) odd-electron molecules, and (3) an EXPANDED octet. ... An example is nitrogen dioxide (NO2).

Discussion

34.	The first ionization enthalpy value ( iH) of second period elements Li, Be andC are 520, 899 and 1086 KJ/mol. Predict whether the first iH value will be close to 690 or 990 KJ/mol. Justify your answer.
Answer» ANSWER: i will gicv N IPHONW E111 -POR MAX AND GHJIVE 3109000 ,EW,IILLION XB0X TYo7u will WIN a ipojjgoh nw s7121 jd[po9rpj m aytb Explanation:

34.

The first ionization enthalpy value ( iH) of second period elements Li, Be andC are 520, 899 and 1086 KJ/mol. Predict whether the first iH value will be close to 690 or 990 KJ/mol. Justify your answer.

Answer»

ANSWER:

i will gicv N IPHONW E111 -POR MAX AND GHJIVE 3109000 ,EW,IILLION XB0X TYo7u will WIN a ipojjgoh nw s7121 jd[po9rpj m aytb

Explanation:

Discussion

35.	All the elements in a periodic table possess same number of __ in their atom
Answer» ANSWER: VALENCE ELECTRONS is the answer

35.

All the elements in a periodic table possess same number of __ in their atom

Answer»

ANSWER:

VALENCE ELECTRONS is the answer

Discussion

36.	Please answer and fiza online aa jaao please don't spam it is a request
Answer» ANSWER: Who are U and fiza APKE DOST hai kay Explanation:

36.

Please answer and fiza online aa jaao please don't spam it is a request

Answer»

ANSWER:

Who are U and fiza APKE DOST hai kay

Explanation:

Discussion

37.	The radio isotopes of Cl ( A = 37, Z = 17) and Cl (A= 35, Z= 17) in naturalchlorine is 1:3. Calculate the fractional atomic mass of chlorine
Answer» Answer: I don't have any questions PLEASE CONTACT US immediately....

37.

The radio isotopes of Cl ( A = 37, Z = 17) and Cl (A= 35, Z= 17) in naturalchlorine is 1:3. Calculate the fractional atomic mass of chlorine

Answer»

Answer:

I don't have any questions PLEASE CONTACT US immediately....

Discussion

38.	Determine the volume of 12 GM of hydrogen at 1.5 atmospheric pressure at 273°C
Answer» Answer: I don't KNOW CHEMISTRY that much but I can tell some ANSWERS

38.

Determine the volume of 12 GM of hydrogen at 1.5 atmospheric pressure at 273°C

Answer»

Answer:

I don't KNOW CHEMISTRY that much but I can tell some ANSWERS

Discussion

39.	Name of the drug contraindicated with digoxin
Answer» ANSWER: LSD Explanation: MARK me as BRAINLIEST.

39.

Name of the drug contraindicated with digoxin

Answer»

ANSWER:

LSD

Explanation:

MARK me as BRAINLIEST.

Discussion

40.	Which of THE following used for making road surface
Answer» Answer: Composite materials are combinations of both asphalt and CONCRETE, and are typically employed in one of two methods. Asphalt overlays LITERALLY are PLACED over a damaged surface, or alternatively PAVEMENT MAY be cracked and seated instead, forming a true new surface.

40.

Which of THE following used for making road surface

Answer»

Answer:

Composite materials are combinations of both asphalt and CONCRETE, and are typically employed in one of two methods. Asphalt overlays LITERALLY are PLACED over a damaged surface, or alternatively PAVEMENT MAY be cracked and seated instead, forming a true new surface.

Discussion

41.	How many grams of h2o are needed to react with 28.0 grams no2?
Answer» the ANSWER of above QUESTION is 20

Discussion

42.	Carbon lies onin which period in modern periodic table
Answer» Answer: It belongs to group 14 of the periodic table. Explanation: Carbon (from Latin: carbo "coal") is a CHEMICAL element with the symbol C and atomic NUMBER 6. It is NONMETALLIC and tetravalent—making four electrons available to form covalent chemical BONDS. It belongs to group 14 of the periodic table. Hope this helps you Mark me as a brainliest

42.

Carbon lies onin which period in modern periodic table

Answer»

Answer:

It belongs to group 14 of the periodic table.

Explanation:

Carbon (from Latin: carbo "coal") is a CHEMICAL element with the symbol C and atomic NUMBER 6. It is NONMETALLIC and tetravalent—making four electrons available to form covalent chemical BONDS. It belongs to group 14 of the periodic table.

Hope this helps you

Mark me as a brainliest

Discussion

43.	Which of the following are addition reaction
Answer» Answer:(a) and (b) are ADDITION REACTION EXPLANATION: addition reaction is given by PI - electrons.

43.

Which of the following are addition reaction

Answer»

Answer:(a) and (b) are ADDITION REACTION

EXPLANATION: addition reaction is given by PI - electrons.

Discussion

44.	10. A reaction has an enthalpy change of +14 kJ mol^-1 and anentropy change of —37 J K-mol^-1 At whattemperature does this endothermic reaction become spontaneous?
Answer» Answer: TH n[0 m,k FOT erthe watthoinc G f9or 9my viude0s and suand subscriibe me iaa asss IB the brwaiinledsts Explanation:

44.

10. A reaction has an enthalpy change of +14 kJ mol^-1 and anentropy change of —37 J K-mol^-1 At whattemperature does this endothermic reaction become spontaneous?

Answer»

Answer:

TH n[0 m,k FOT erthe watthoinc G f9or 9my viude0s and suand subscriibe me iaa asss IB the brwaiinledsts

Explanation:

Discussion

45.	How low ionisation energy favours the formation of ionic bond
Answer» Answer: In forming an ionic bond, ONE atom must form a cation by LOSING one or more electrons. In general, ELEMENTS having low ionisation ENERGIES have a more FAVOURABLE chance to form a cation, thereby having a greater tendency to form ionic bonds.

45.

How low ionisation energy favours the formation of ionic bond

Answer»

Answer:

In forming an ionic bond, ONE atom must form a cation by LOSING one or more electrons. In general, ELEMENTS having low ionisation ENERGIES have a more FAVOURABLE chance to form a cation, thereby having a greater tendency to form ionic bonds.

Discussion

46.	Draw the line of spectrum of hydrogen atom hen anelectron drop from n=5 to ground estate
Answer» EXPLANATION: No. of LINES =∑(n 2 −n 1 ) =∑(6−2) =∑4 =∑ Balmer 4 , Paschen 3 , Brackett2 , Lyman1=10 No. of spectral lines in Balmer SERIES will be in visible range. Hence no. of spectral lines in visible range will be 4.

46.

Draw the line of spectrum of hydrogen atom hen anelectron drop from n=5 to ground estate

Answer»

EXPLANATION:

No. of LINES =∑(n

2

−n

1

)

=∑(6−2)

=∑4

=∑

Balmer

4

,

Paschen

3

,

Brackett2 , Lyman1=10

No. of spectral lines in Balmer SERIES will be in visible range.

Hence no. of spectral lines in visible range will be 4.

Discussion

47.	Is cuso4 a trivalent metal???
Answer» ANSWER: Hey mate Explanation: I DONT THINK so i GUESS its tetravalent

47.

Is cuso4 a trivalent metal???

Answer»

ANSWER:

Hey mate

Explanation:

I DONT THINK so i GUESS its tetravalent

Discussion

48.	খাদ্য লবণ ও বালুর মিশ্রণে কোন পদ্ধতি ব্যবহার করা হয়
Answer» ANSWER: ছাকন ও পরিস্রাবন এবং বাষ্পিভবন Explanation: এটাই CORRECT Answer. পরীক্ষনে উল্লেখ আছে।

48.

খাদ্য লবণ ও বালুর মিশ্রণে কোন পদ্ধতি ব্যবহার করা হয়

Answer»

ANSWER:

ছাকন ও পরিস্রাবন এবং বাষ্পিভবন

Explanation:

এটাই CORRECT Answer.

পরীক্ষনে উল্লেখ আছে।

Discussion

49.	If the volume of a gas at 300K and 5.1625×10^4 Nm-2 is 1dm3.what will be its volume at STP
Answer» ANSWER: PLEASE FOLLOW me ☺️☺️☺️☺️☺️

49.

If the volume of a gas at 300K and 5.1625×10^4 Nm-2 is 1dm3.what will be its volume at STP

Answer»

ANSWER:

PLEASE FOLLOW me ☺️☺️☺️☺️☺️

Discussion

50.	(ii) BF4^_নিউক্লিওফাইল হিসেবে আচরণ করবে কি না যুক্তিসহ লেখাে।
Answer» Answer: Kya LIKHA HEA I'm not UNDERSTAND your language

50.

(ii) BF4^_নিউক্লিওফাইল হিসেবে আচরণ করবে কি না যুক্তিসহ লেখাে।

Answer»

Answer:

Kya LIKHA HEA

I'm not UNDERSTAND your language

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Write a name of an element having variable valency.​

Question 1:The fraction of thermally excited atoms inFlame photometry is determined byequation​

Discuss the formation of covalent bonds in molecules ofii. Ethylene​

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what is a amount of heat to be supplied to a heat engine working between 95 °C and 15 °C.if it has to do a work of 850J?​

CH3-CHBr-CCliodine-CH2-Hname this compound by IUPAC rules ???plzzzzz...❤✔✅​

Question 6:mixture provides highest flametemperature.​

Q. 18 Suggest a suitable method to separate Two volatile components withappreciable difference in boiling points.Your answer​

Method Simple DISTILLATION can be used to separate TWO volatile components with appreciable difference in boiling points. (c) Example MIXTURE of mustard OIL and water. Method Separating runnel is used to separate a mixture of immiscible liquids.

Find the total number of moles present in3 kg of ammonium nitrate?​

Discuss the formation of covalent bonds in molecules ofi. Ammoniaii. Ethyleneiii. Carbon dioxide.​

3.) Deline Moderan periodic law and discuss the differentblocks in the modem periodic table.

6.What will be the external pressure at which watermay boil at 120°C?A. 1489 mm of Hg B. 790 mm of HgC. 700 mm of Hg D. 100 mm of Hg​

Na2o2 is used in the reaction that effect roll is known as.....​

Calculate the ratio of atoms present in 5 gram of magnesium and 5 gram of iron​

18.5 why hydroxidee ions and bicarbonate ionscannot be. mixtogether​

If An element formsan oxide A2O3 which is acidic in nature Identify Aas a metal or nonnon metal. Justify​

And plz explain it ​

Question 10of the following element can not bedetected and estimated by flamephotometric technique.sodiumMagnesiumpotassiumoxygen​

GURAV OMKAR HEMANTQuestion 1 :The fraction of thermally excited atoms inFlame photometry is determined byequation.Boltzmann distribution​

The addition of solid sodium carbonate to pure water causes__________ *​

Evaporation differs from boiling.ExplainPlease help me to solve this chemistry question answer ​

According to the structure, the Cl atoms of bleachingpowder have oxidation numbersसंरचना के अनुसार विरंजक चूर्ण में C| परमाणुओं के ऑक्सीकरणअंक हैंA0,0B0, -1+1, -1D0, +1​

Write a experiment of effect of heat an ice with aim, apparatus, observation and conlusion​

Khushi Kuch bolo yarr​

भूत वालाsdjfhfdkßsidjdjhdjfhgjbfdkksksksjsddmdlkttypyp​

please don't spamno irrelevant stuffno guess class 12 question​

किसी आवत में बाई और दाहिनी और बढ़ने पर संयोजकता पहले बढ़ती पुनः घटती है क्यों ​

A) Write the electronic configuration ofFe 3+, Cr 3+ , Mn2+ , Zn2+ (At No. of Fe-26 , Cr-24, Mn- 25, Zn- 30 )​

Determine the volume of 12 gm hydrogen at 1.5 atmospheric pressure at 273°C​

Chlorination of ethane in the presence of U. V. light followed by treatment with aq. NaOH gives_______ì​

Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following; (04)a. A solid non- metal of valency 3.b. A gas of valency 2.c. A metal of valency 1.d. A non- metal of valency 4​

Write the examples of odd electron molecule and expanded Octet molecule.​

The first ionization enthalpy value ( iH) of second period elements Li, Be andC are 520, 899 and 1086 KJ/mol. Predict whether the first iH value will be close to 690 or 990 KJ/mol. Justify your answer. ​

All the elements in a periodic table possess same number of __ in their atom​

Please answer and fiza online aa jaao please don't spam it is a request​

The radio isotopes of Cl ( A = 37, Z = 17) and Cl (A= 35, Z= 17) in naturalchlorine is 1:3. Calculate the fractional atomic mass of chlorine ​

Determine the volume of 12 GM of hydrogen at 1.5 atmospheric pressure at 273°C​

Name of the drug contraindicated with digoxin

Which of THE following used for making road surface

How many grams of h2o are needed to react with 28.0 grams no2?

Carbon lies onin which period in modern periodic table​

Hope this helps you

Which of the following are addition reaction​

10. A reaction has an enthalpy change of +14 kJ mol^-1 and anentropy change of —37 J K-mol^-1 At whattemperature does this endothermic reaction become spontaneous?​

How low ionisation energy favours the formation of ionic bond ​

Draw the line of spectrum of hydrogen atom hen anelectron drop from n=5 to ground estate​

Is cuso4 a trivalent metal??? ​

খাদ্য লবণ ও বালুর মিশ্রণে কোন পদ্ধতি ব্যবহার করা হয়​

If the volume of a gas at 300K and 5.1625×10^4 Nm-2 is 1dm3.what will be its volume at STP​

(ii) BF4^_নিউক্লিওফাইল হিসেবে আচরণ করবে কি না যুক্তিসহ লেখাে।​

Write a name of an element having variable valency.

Question 1:The fraction of thermally excited atoms inFlame photometry is determined byequation

Discuss the formation of covalent bonds in molecules ofii. Ethylene

Question 7 :The ratio -dl/dc gives the rate of decreaseof ------------- of radiation with concentrationof absorbing medium.

what is a amount of heat to be supplied to a heat engine working between 95 °C and 15 °C.if it has to do a work of 850J?

CH3-CHBr-CCliodine-CH2-Hname this compound by IUPAC rules ???plzzzzz...❤✔✅

Question 6:mixture provides highest flametemperature.

Q. 18 Suggest a suitable method to separate Two volatile components withappreciable difference in boiling points.Your answer

Find the total number of moles present in3 kg of ammonium nitrate?

Discuss the formation of covalent bonds in molecules ofi. Ammoniaii. Ethyleneiii. Carbon dioxide.

6.What will be the external pressure at which watermay boil at 120°C?A. 1489 mm of Hg B. 790 mm of HgC. 700 mm of Hg D. 100 mm of Hg

Na2o2 is used in the reaction that effect roll is known as.....

Calculate the ratio of atoms present in 5 gram of magnesium and 5 gram of iron

18.5 why hydroxidee ions and bicarbonate ionscannot be. mixtogether

If An element formsan oxide A2O3 which is acidic in nature Identify Aas a metal or nonnon metal. Justify

And plz explain it

Question 10of the following element can not bedetected and estimated by flamephotometric technique.sodiumMagnesiumpotassiumoxygen

GURAV OMKAR HEMANTQuestion 1 :The fraction of thermally excited atoms inFlame photometry is determined byequation.Boltzmann distribution

The addition of solid sodium carbonate to pure water causes__________ *

Evaporation differs from boiling.ExplainPlease help me to solve this chemistry question answer

According to the structure, the Cl atoms of bleachingpowder have oxidation numbersसंरचना के अनुसार विरंजक चूर्ण में C| परमाणुओं के ऑक्सीकरणअंक हैंA0,0B0, -1+1, -1D0, +1

Write a experiment of effect of heat an ice with aim, apparatus, observation and conlusion

Khushi Kuch bolo yarr

भूत वालाsdjfhfdkßsidjdjhdjfhgjbfdkksksksjsddmdlkttypyp

please don't spamno irrelevant stuffno guess class 12 question

किसी आवत में बाई और दाहिनी और बढ़ने पर संयोजकता पहले बढ़ती पुनः घटती है क्यों

A) Write the electronic configuration ofFe 3+, Cr 3+ , Mn2+ , Zn2+ (At No. of Fe-26 , Cr-24, Mn- 25, Zn- 30 )

Determine the volume of 12 gm hydrogen at 1.5 atmospheric pressure at 273°C

Chlorination of ethane in the presence of U. V. light followed by treatment with aq. NaOH gives_______ì

Match the atomic numbers 4, 14, 8, 15 and 19 with each of the following; (04)a. A solid non- metal of valency 3.b. A gas of valency 2.c. A metal of valency 1.d. A non- metal of valency 4

Write the examples of odd electron molecule and expanded Octet molecule.

The first ionization enthalpy value ( iH) of second period elements Li, Be andC are 520, 899 and 1086 KJ/mol. Predict whether the first iH value will be close to 690 or 990 KJ/mol. Justify your answer.

All the elements in a periodic table possess same number of __ in their atom

Please answer and fiza online aa jaao please don't spam it is a request

The radio isotopes of Cl ( A = 37, Z = 17) and Cl (A= 35, Z= 17) in naturalchlorine is 1:3. Calculate the fractional atomic mass of chlorine

Determine the volume of 12 GM of hydrogen at 1.5 atmospheric pressure at 273°C

Carbon lies onin which period in modern periodic table

Which of the following are addition reaction

10. A reaction has an enthalpy change of +14 kJ mol^-1 and anentropy change of —37 J K-mol^-1 At whattemperature does this endothermic reaction become spontaneous?

How low ionisation energy favours the formation of ionic bond

Draw the line of spectrum of hydrogen atom hen anelectron drop from n=5 to ground estate

Is cuso4 a trivalent metal???

খাদ্য লবণ ও বালুর মিশ্রণে কোন পদ্ধতি ব্যবহার করা হয়

If the volume of a gas at 300K and 5.1625×10^4 Nm-2 is 1dm3.what will be its volume at STP

(ii) BF4^_নিউক্লিওফাইল হিসেবে আচরণ করবে কি না যুক্তিসহ লেখাে।