52639 + Interview Questions in Secondary School in Chemistry

1.	Lithium does not react with proton donors like (A) C,H,OH(B) NH3(9)(C) 1- Butyne(D) All of theseAB
Answer» ong>EXPLANATION: Lithium does not react with proton DONORS like Answer is (B) NH3(9)

1.

Lithium does not react with proton donors like (A) C,H,OH(B) NH3(9)(C) 1- Butyne(D) All of theseAB

Answer»

ong>EXPLANATION:

Lithium does not react with proton DONORS like

Answer is (B) NH3(9)

Discussion

2.	Predict the shapes of the following molecule using the VSEPR model.a) NH3 b) CIF: c) XeF2 d) BrFs e) XeF4
Answer» ONG>Answer: Predict the shapes of the following molecule USING the VSEPR model. a) NH3 b) CIF: c) XeF2 d) BrFs E) XeF4 . 1. 3 votes

2.

Predict the shapes of the following molecule using the VSEPR model.a) NH3 b) CIF: c) XeF2 d) BrFs e) XeF4

Answer» ONG>Answer:

Predict the shapes of the following molecule USING the VSEPR model. a) NH3 b) CIF: c) XeF2 d) BrFs E) XeF4 . 1.

3 votes

Discussion

3.	Explain isomerism and alkane with m.f.C5H2
Answer» ONG>ANSWER: not KNOW HOPE it is helpfull

3.

Explain isomerism and alkane with m.f.C5H2

Answer» ONG>ANSWER:

not KNOW

HOPE it is helpfull

Discussion

4.	Name the type of this reaction justfying your answer
Answer» ong>Explanation: PLEASE write WHOLE QUESTION..

4.

Name the type of this reaction justfying your answer

Answer»

ong>Explanation:

PLEASE write WHOLE QUESTION..

Discussion

5.	6.What is the permissible noise limit of 120 db? a) 30 minutesb) 2 minutesc) 1 minuted) 30 seconds7.Greenhouses gases causing a rise of 3℃ rise in the overall global temperature in the past century are CFCs. The CFC used in refrigerators isa) Ammoniab) Freonc) Methaned) Carbon dioxide8.In which layer of atmosphere ozone is very vital for all vegetation?a) Upper atmosphereb) Below atmospherec) Ground leveld) Below ground level9.Ozone can be destroyed by the following free radical(s)a) Chlorine radical (Cl)b) Hydroxyl radicals (OH)c) Nitric oxide radical (NO)d) all of these10.Which of the following is the oldest and the most common method used to dump the solid wastes?a) Riverb) Oceanc) Landfilld) None of the above11.Why is recycled paper banned for use in food containers?a) Because it creates a lot of spacesb) Because it creates contaminationc) Because paper can be used only one timed) Because paper is very thick and can’t cover the food containers12.What is called for a temporary hearing loss?a) Temporary ear painb) Temporary hearing problemc) Temporary threshold shiftd) Temporary hearing shift13.Which of the following sound is pleasant to our ears?a) Heavy machineryb) Transportation equipmentc) Loud noised) Music14.What is the dB of a threshold of hearing?a) 0b) 10c) 50d) 100
Answer» ong>Answer: Match the following elements of column I with their prop Column 1 Column II 1. Chlorine (a) Solid halogen 2. Fluorine (b) Radioactive 3. Bromine (C) Reddish brown liquid 4. Iodine (d) Highest electron affinity 5. ASTATINE (E) Most electronegative Complete the following equations : Na

5.

6.What is the permissible noise limit of 120 db? a) 30 minutesb) 2 minutesc) 1 minuted) 30 seconds7.Greenhouses gases causing a rise of 3℃ rise in the overall global temperature in the past century are CFCs. The CFC used in refrigerators isa) Ammoniab) Freonc) Methaned) Carbon dioxide8.In which layer of atmosphere ozone is very vital for all vegetation?a) Upper atmosphereb) Below atmospherec) Ground leveld) Below ground level9.Ozone can be destroyed by the following free radical(s)a) Chlorine radical (Cl)b) Hydroxyl radicals (OH)c) Nitric oxide radical (NO)d) all of these10.Which of the following is the oldest and the most common method used to dump the solid wastes?a) Riverb) Oceanc) Landfilld) None of the above11.Why is recycled paper banned for use in food containers?a) Because it creates a lot of spacesb) Because it creates contaminationc) Because paper can be used only one timed) Because paper is very thick and can’t cover the food containers12.What is called for a temporary hearing loss?a) Temporary ear painb) Temporary hearing problemc) Temporary threshold shiftd) Temporary hearing shift13.Which of the following sound is pleasant to our ears?a) Heavy machineryb) Transportation equipmentc) Loud noised) Music14.What is the dB of a threshold of hearing?a) 0b) 10c) 50d) 100

Answer»

ong>Answer:

Match the following elements of column I with their prop

Column 1

Column II

1. Chlorine

(a) Solid

halogen

2. Fluorine

(b) Radioactive

3. Bromine

(C) Reddish brown liquid

4. Iodine

(d) Highest electron affinity

5. ASTATINE

(E) Most electronegative

Complete the following equations :

Na

Discussion

6.	Vinylic substitution in hindi
Answer» ong>ANSWER: I didn't understand Explanation: VINYLIC SUBSTITUTION in HINDI

6.

Vinylic substitution in hindi

Answer»

ong>ANSWER:

I didn't understand

Explanation:

VINYLIC SUBSTITUTION in HINDI

Discussion

7.	Balance the following equation by ion electron method in acidic medium Cr,0, +C,0, +H' Cr*** + C0, +H2O
Answer» ong>Answer: can ANYONE SOLVE this QUESTIONS in a PAPER and keep. any questions Explanation: ____ represents the relationships between objects and classes.

7.

Balance the following equation by ion electron method in acidic medium Cr,0, +C,0, +H' Cr*** + C0, +H2O

Answer»

ong>Answer:

can ANYONE SOLVE this QUESTIONS in a PAPER and keep. any questions

Explanation:

____ represents the relationships between objects and classes.

Discussion

8.	What effect does an increase in the concentration of H 3 O^ + *ions in a solution have on pH of a solution?
Answer» ong>Answer: If the hydronium concentration increases, the PH decreases, CAUSING the SOLUTION to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution

8.

What effect does an increase in the concentration of H 3 O^ + *ions in a solution have on pH of a solution?

Answer»

ong>Answer:

If the hydronium concentration increases, the PH decreases, CAUSING the SOLUTION to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution

Discussion

9.	What volume of a 5 M H2SO4 solution should be added to a 150 mLof 1 M H2SO4 solution to obtain a solution of sulphuric acid of molarity 2.5?
Answer» ONG>ANSWER: ohhhhhhhhhhkkkkkkkkkkk....

Discussion

10.	What is oxidation and Reduction ? Define itonly by using electron.no need to answer who does not know it.
Answer» ong>EXPLANATION: Loss of ELECTRON is oxidation Gain of electron is reduction

10.

What is oxidation and Reduction ? Define itonly by using electron.no need to answer who does not know it.

Answer»

ong>EXPLANATION:

Loss of ELECTRON is oxidation

Gain of electron is reduction

Discussion

11.	2.Which treaty was signed in 187 for the protection of ozone layer? a) The Montreal Protocolb) The Kyoto Protocolc) Ozone Summitd) Wildlife Conservation Act3.At what decibel instantaneous rupture of membrane happens?a) 100b) 120c) 146d) 1504.Which of the following solid wastes describe the term ‘Municipal Solid Waste’?a) Toxicb) Hazardousc) Non-toxicd) Non-hazardous5.Which of the following is an organic gas?a) Hydrocarbonsb) Aldehydes c) Ketonesd) Ammonia
Answer» ONG>Answer: 2 OPP:C 3opp;b 4opp;c 5opp;d

11.

2.Which treaty was signed in 187 for the protection of ozone layer? a) The Montreal Protocolb) The Kyoto Protocolc) Ozone Summitd) Wildlife Conservation Act3.At what decibel instantaneous rupture of membrane happens?a) 100b) 120c) 146d) 1504.Which of the following solid wastes describe the term ‘Municipal Solid Waste’?a) Toxicb) Hazardousc) Non-toxicd) Non-hazardous5.Which of the following is an organic gas?a) Hydrocarbonsb) Aldehydes c) Ketonesd) Ammonia

Answer» ONG>Answer:

2 OPP:C

3opp;b

4opp;c

5opp;d

Discussion

12.	Calculate the mole fraction of benzene and carbontetrachloride in a binary mixture. The number of moles of benzene is 0.3 gmol-1and the number of moles of carbon tetrachloride is 0.4 g mol-1.
Answer» ong>Answer: I go W but not the other day saniya says we will not have any of the day we are here and we willing noticed LEAVEN there from attack homes FOREVER Rs.15,000tgyyyyftyfryt6tttyy.5,400 you have no reason not sir TODAY I am a s God and God and you have to come and go to my kingdom of

12.

Calculate the mole fraction of benzene and carbontetrachloride in a binary mixture. The number of moles of benzene is 0.3 gmol-1and the number of moles of carbon tetrachloride is 0.4 g mol-1.

Answer»

ong>Answer:

I go W but not the other day saniya says we will not have any of the day we are here and we willing noticed LEAVEN there from attack homes FOREVER Rs.15,000tgyyyyftyfryt6tttyy.5,400 you have no reason not sir TODAY I am a s God and God and you have to come and go to my kingdom of

Discussion

13.	17 Which of the following is notelectron deficientO NH3O BF3 Alcl3О вн3
Answer» ong>ANSWER: option ( C ) ALCL3 is the correct answer Explanation: please mark as brainleist answer N follow me

13.

17 Which of the following is notelectron deficientO NH3O BF3 Alcl3О вн3

Answer»

ong>ANSWER:

option ( C ) ALCL3 is the correct answer

Explanation:

please mark as brainleist answer N follow me

Discussion

14.	Which one of the following conditions is incorrect for a well behaved wave function (V) (A)y must be finite(B)Ymust be single valued(C)ymust be infinite(D)y must be continuous
Answer» ONG>ANSWER: The answer is a OPTION B

14.

Which one of the following conditions is incorrect for a well behaved wave function (V) (A)y must be finite(B)Ymust be single valued(C)ymust be infinite(D)y must be continuous

Answer» ONG>ANSWER:

The answer is a OPTION B

Discussion

15.	Formula of Bleaching Powder ?
Answer» ONG>EXPLANATION: Ca(CLO)2 is the formula of bleaching powder

Discussion

16.	Which of the following gases are called Greenhouse gases? (a) Methane(b) Nitrogen(c) Carbon dioxide(d) Both a and c
Answer» ANE and CO2 are CALLED GREENHOUSE GAS.

Discussion

17.	A bacl2+b al2(so4)3-- c alcl3+d baso4 what is value of a, b, c, d
Answer» ong>Answer: The balanced equation is 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3 here a = 3 , b = 1 , C = 2 and d = 3

17.

A bacl2+b al2(so4)3-- c alcl3+d baso4 what is value of a, b, c, d

Answer»

ong>Answer:

The balanced equation is

3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3

here a = 3 , b = 1 , C = 2 and d = 3

Discussion

18.	C6H5Cl+CH3COCl anhy.AlCl3 mention me koee product formed in this reaction
Answer» ong>Answer: Hey buddy here is your answer..... when benzene REACT with ch3cocl in the PRESENCE of ALCL3 acetophenone will form. this is a electrophilic SUBSTITUTION reaction. it is popularyly named as friedal cryct acylation reaction Explanation: I hope that it will HELP you and give my answer Brainliest

18.

C6H5Cl+CH3COCl anhy.AlCl3 mention me koee product formed in this reaction

Answer»

ong>Answer:

Hey buddy here is your answer.....

when benzene REACT with ch3cocl in the PRESENCE of ALCL3 acetophenone will form. this is a electrophilic SUBSTITUTION reaction. it is popularyly named as friedal cryct acylation reaction

Explanation:

I hope that it will HELP you and give my answer Brainliest

Discussion

19.	Ans01: Calentate AS a 90°C: A = 184678 Joule/mol AG' = 109854 Joule/mol
Answer» ONG>ANSWER: no BUDDY Don't KNOW answer

Discussion

20.	Plz ans above question with explanation
Answer» ONG>Answer: A ) Li Explanation: the atomic size of LITHIUM is very SMALL . Therefore it cannot STABILISE a larger peroxide or superoxide ion.

20.

Plz ans above question with explanation

Answer» ONG>Answer:

A ) Li

Explanation:

the atomic size of LITHIUM is very SMALL . Therefore it cannot STABILISE a larger peroxide or superoxide ion.

Discussion

21.	How to calculate valance shellplease help I give anything
Answer» ong>Answer: just use the NUMBER of electrons in the OUTERMOST shell. If the outer shell is full (in other words, if it has eight electrons or, for the FIRST shell, two), the element is inert and will not react EASILY with other elements.

21.

How to calculate valance shellplease help I give anything

Answer»

ong>Answer:

just use the NUMBER of electrons in the OUTERMOST shell. If the outer shell is full (in other words, if it has eight electrons or, for the FIRST shell, two), the element is inert and will not react EASILY with other elements.

Discussion

22.	Q.6. Tick the correct options : 1. The yellowish gas among the following is(ol Fluorine(b) Chlorine(c) Bromine2. Which of the following is a covalent chloride(d) lodine3. To decrease the chemical reactivity, alkali metals are converted to(a) Oxides(b) Chlorides(c) Amalgams(d) Nitrates4. The colour of alkal halides is(a) White(b) Red(c) Yellow5. Atoms of which elements have their outer layers occupied by seven electrons.(a) Alkali metals(c) Halogens(d) None of these(b) Inert gases(d) Alkaline earth me(a) Sodium Chloride (b) Potassium Chloride (c) Magnesium Chloride (d) Phosphorus Cher
Answer» ONG>ANSWER: ANS1) fluorine ans2) sodium chloride ans3) chlorides qns4) yellow ans5) none of these

22.

Q.6. Tick the correct options : 1. The yellowish gas among the following is(ol Fluorine(b) Chlorine(c) Bromine2. Which of the following is a covalent chloride(d) lodine3. To decrease the chemical reactivity, alkali metals are converted to(a) Oxides(b) Chlorides(c) Amalgams(d) Nitrates4. The colour of alkal halides is(a) White(b) Red(c) Yellow5. Atoms of which elements have their outer layers occupied by seven electrons.(a) Alkali metals(c) Halogens(d) None of these(b) Inert gases(d) Alkaline earth me(a) Sodium Chloride (b) Potassium Chloride (c) Magnesium Chloride (d) Phosphorus Cher

Answer» ONG>ANSWER:

ANS1) fluorine

ans2) sodium chloride

ans3) chlorides

qns4) yellow

ans5) none of these

Discussion

23.	Hydrogen form covalent chlorides because * it can give electrons to chlorine it can share electrons with chlorine it can give electrons to chlorine atoms to form chloride ions O it cannot share electrons with chlorine atoms
Answer» ong>ANSWER: answer is it *can* *share* *ELECTRONS* *with* *CHLORINE*

23.

Hydrogen form covalent chlorides because * it can give electrons to chlorine it can share electrons with chlorine it can give electrons to chlorine atoms to form chloride ions O it cannot share electrons with chlorine atoms

Answer»

ong>ANSWER:

answer is it can share ELECTRONS with CHLORINE

Discussion

24.	Can column chromatography can be used for bulk separation of organic compounds? Justify your answer.
Answer» /p> EXPLANATION: it is USED only to seperate ink from dye HOPE it HELPS MARK me as brainlest

24.

Can column chromatography can be used for bulk separation of organic compounds? Justify your answer.

Answer»

/p>

EXPLANATION: it is USED only to seperate ink from dye

HOPE it HELPS MARK me as brainlest

Discussion

25.	Molecular formulae of n with hydrogen
Answer» ONG>ANSWER: I don't the answer sorry and THANKS for you are free points

25.

Molecular formulae of n with hydrogen

Answer» ONG>ANSWER:

I don't the answer

sorry and THANKS for you are free points

Discussion

26.	A metal M, on treating with an acid H2SO4, form the salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the metal M ,salt and evolved gas Y. * Cu, CuSO4 and CO2 Zn,ZnS04 and H2 O , Cu, CuCl2 and H2 Ag, Ag2804 and H2
Answer» ONG>ANSWER: answer is Cu, CUCL2 and H2 if you are interested in my answer plz give me like and ALSO follow me then I FOLLOWED you

26.

A metal M, on treating with an acid H2SO4, form the salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the metal M ,salt and evolved gas Y. * Cu, CuSO4 and CO2 Zn,ZnS04 and H2 O , Cu, CuCl2 and H2 Ag, Ag2804 and H2

Answer» ONG>ANSWER:

answer is Cu, CUCL2 and H2

if you are interested in my answer plz give me like and ALSO follow me then I FOLLOWED you

Discussion

27.	Which of the following does not react with sulphuric acid in any condition? * ZincPlatinumMagnesiumIron
Answer» align="absmiddle" alt="\Large{\underline{\underline{\red{\tt{\purple{\leadsto } SolutioN:-}}}}}" class="latex-formula" id="TexFormula1" src="https://tex.z-dn.net/?f=%5CLarge%7B%5Cunderline%7B%5Cunderline%7B%5Cred%7B%5Ctt%7B%5Cpurple%7B%5Cleadsto%20%7D%20SolutioN%3A-%7D%7D%7D%7D%7D" title="\Large{\underline{\underline{\red{\tt{\purple{\leadsto } SolutioN:-}}}}}"> The given metals to us are , Zinc ( Zn) Platinum ( Pt ) Magnesium ( Mg ) IRON ( Fe ) Among the given metals the metal which does not react with Sulphuric acid ( $\sf H_2SO_4$ ) is Platinum . This is so because all the other three elements Zinc , Magnesium and Iron are placed at a higher level than Hydrogen in reactivity series . So these metals have the ability to displace hydrogen . Whereas Platinum is located below hydrogen in the activity series so it would not react with sulphuric acid under any case. Also platinum is a noble metal. _______________________________________ $\Large{\underline{\underline{\red{\tt{\purple{\leadsto } ExtrA\:\: InformatioN:-}}}}}$ $\bf \green{\purple{\bullet} \:\: Combination\: Reaction} :-$ A reaction in which TWO or more reactants combine to form a single product is known as combination reaction. $\boxed{\purple{\tt{\dag \underset{\orange{Nitrogen}}{N_2}+\underset{\orange{Oxygen}}{O_2}\longrightarrow \underset{\orange{Nitricoxide}}{2NO}}}}$ $\boxed{\purple{\tt{\dag \underset{\orange{Ammonia}}{NH_3}+\underset{\orange{Water}}{H_2O}\longrightarrow \underset{\orange{Ammonium\: hydroxide}}{NH_4OH}}}}$ $\bf \green{ \purple{\bullet} \:\: <klux>DECOMPOSITION</klux>\: Reaction} :-$ A reaction in which of single product breaks down to form two or more simpler substances or products is known as decomposition reaction . This is further divided into : $\tt Chemical\: Decomposition$ $\tt Photolytic \:Decomposition$ $\tt Electrolytic\: Decomposition$ $\tt Thermal\: Decomposition$ $\boxed{\purple{\tt{\dag \underset{\orange{Sodium\:nitrate}}{NaNO_3} \overset{\Delta}{\longrightarrow}\underset{\orange{Sodium\:nitrite}}{NaNO_2}+ \underset{\orange{Oxygen}}{O_2}}}}$ $\boxed{\purple{\tt{\dag \underset{\orange{Water}}{H_2O} \xrightarrow{\red{Electrolytic\: Decomposition}}\underset{\orange{Hydrogen}}{2H_2}+ \underset{\orange{Oxygen}}{O_2}}}}$ $\bf \green{\purple{\bullet} \:\: Displacement\: Reaction} :-$ A reaction in which a more reactive metal metal from its SALT solution is known as displacement reaction. Elements placed at higher level in the reactivity series can displace elements placed below them . $\boxed{\purple{\tt{\dag\underset{\orange{ Copper\: Sulphate}}{CuSO_4}+\underset{\orange{ Iron}}{Fe}\longrightarrow\underset{\orange{ Ferrous\: Sulphate}}{FeSO_4} +\underset{\orange{ Copper}}{Cu} }}}$ $\boxed{\purple{\tt{\dag\underset{\orange{ Pottasium\: chloride}}{2KCl}+\underset{\orange{ Fluorine}}{F_2}\longrightarrow\underset{\orange{ Pottasium\: Fluoride}}{2KF} +\underset{\orange{ Chlorine}}{Cl_2} }}}$ $\bf \green{ \purple{\bullet} \:\: Double\: Displacement\:\: Reaction} :-$ A reaction in which the radicals of reactants are interchanged. A double decomposition or a double displacement reaction between acid and base is called neutralization reaction. precipitation reaction also double displacement reaction. $\boxed{\purple{\tt{\dag\underset{\orange{ Sodium\: Sulphate}}{Na_2SO_4}+\underset{\orange{ Zinc\:nitrate}}{Zn(NO_3)_2}\longrightarrow\underset{\orange{Sodium\:nitrate }}{2NaNO_3} +\underset{\orange{Zinc\: sulphate }}{ZnSO_4} }}}$ $\boxed{\purple{\tt{\dag\underset{\orange{Pottasium\: hydroxide }}{2KOH}+\underset{\orange{Sulphuric\:Acid }}{H_2SO_4}\longrightarrow\underset{\orange{ Pottasium\: Sulphate}}{K_2SO_4} +\underset{\orange{ Water}}{2H_2O} }}}$

27.

Which of the following does not react with sulphuric acid in any condition? * ZincPlatinumMagnesiumIron

Answer»

align="absmiddle" alt="\Large{\underline{\underline{\red{\tt{\purple{\leadsto } SolutioN:-}}}}}" class="latex-formula" id="TexFormula1" src="https://tex.z-dn.net/?f=%5CLarge%7B%5Cunderline%7B%5Cunderline%7B%5Cred%7B%5Ctt%7B%5Cpurple%7B%5Cleadsto%20%7D%20SolutioN%3A-%7D%7D%7D%7D%7D" title="\Large{\underline{\underline{\red{\tt{\purple{\leadsto } SolutioN:-}}}}}">

The given metals to us are ,

Zinc ( Zn)
Platinum ( Pt )
Magnesium ( Mg )
IRON ( Fe )

Among the given metals the metal which does not react with Sulphuric acid ( $\sf H_2SO_4$ ) is Platinum .

This is so because all the other three elements Zinc , Magnesium and Iron are placed at a higher level than Hydrogen in reactivity series . So these metals have the ability to displace hydrogen .

Whereas Platinum is located below hydrogen in the activity series so it would not react with sulphuric acid under any case. Also platinum is a noble metal.

_______________________________________

$\Large{\underline{\underline{\red{\tt{\purple{\leadsto } ExtrA\:\: InformatioN:-}}}}}$

$\bf \green{\purple{\bullet} \:\: Combination\: Reaction} :-$

A reaction in which TWO or more reactants combine to form a single product is known as combination reaction.

$\boxed{\purple{\tt{\dag \underset{\orange{Nitrogen}}{N_2}+\underset{\orange{Oxygen}}{O_2}\longrightarrow \underset{\orange{Nitricoxide}}{2NO}}}}$

$\boxed{\purple{\tt{\dag \underset{\orange{Ammonia}}{NH_3}+\underset{\orange{Water}}{H_2O}\longrightarrow \underset{\orange{Ammonium\: hydroxide}}{NH_4OH}}}}$

$\bf \green{ \purple{\bullet} \:\: <klux>DECOMPOSITION</klux>\: Reaction} :-$

A reaction in which of single product breaks down to form two or more simpler substances or products is known as decomposition reaction . This is further divided into :

$\tt Chemical\: Decomposition$
$\tt Photolytic \:Decomposition$
$\tt Electrolytic\: Decomposition$
$\tt Thermal\: Decomposition$

$\boxed{\purple{\tt{\dag \underset{\orange{Sodium\:nitrate}}{NaNO_3} \overset{\Delta}{\longrightarrow}\underset{\orange{Sodium\:nitrite}}{NaNO_2}+ \underset{\orange{Oxygen}}{O_2}}}}$

$\boxed{\purple{\tt{\dag \underset{\orange{Water}}{H_2O} \xrightarrow{\red{Electrolytic\: Decomposition}}\underset{\orange{Hydrogen}}{2H_2}+ \underset{\orange{Oxygen}}{O_2}}}}$

$\bf \green{\purple{\bullet} \:\: Displacement\: Reaction} :-$

A reaction in which a more reactive metal metal from its SALT solution is known as displacement reaction. Elements placed at higher level in the reactivity series can displace elements placed below them .

$\boxed{\purple{\tt{\dag\underset{\orange{ Copper\: Sulphate}}{CuSO_4}+\underset{\orange{ Iron}}{Fe}\longrightarrow\underset{\orange{ Ferrous\: Sulphate}}{FeSO_4} +\underset{\orange{ Copper}}{Cu} }}}$

$\boxed{\purple{\tt{\dag\underset{\orange{ Pottasium\: chloride}}{2KCl}+\underset{\orange{ Fluorine}}{F_2}\longrightarrow\underset{\orange{ Pottasium\: Fluoride}}{2KF} +\underset{\orange{ Chlorine}}{Cl_2} }}}$

$\bf \green{ \purple{\bullet} \:\: Double\: Displacement\:\: Reaction} :-$

A reaction in which the radicals of reactants are interchanged. A double decomposition or a double displacement reaction between acid and base is called neutralization reaction. precipitation reaction also double displacement reaction.

$\boxed{\purple{\tt{\dag\underset{\orange{ Sodium\: Sulphate}}{Na_2SO_4}+\underset{\orange{ Zinc\:nitrate}}{Zn(NO_3)_2}\longrightarrow\underset{\orange{Sodium\:nitrate }}{2NaNO_3} +\underset{\orange{Zinc\: sulphate }}{ZnSO_4} }}}$

$\boxed{\purple{\tt{\dag\underset{\orange{Pottasium\: hydroxide }}{2KOH}+\underset{\orange{Sulphuric\:Acid }}{H_2SO_4}\longrightarrow\underset{\orange{ Pottasium\: Sulphate}}{K_2SO_4} +\underset{\orange{ Water}}{2H_2O} }}}$

Discussion

28.	Which symbol is this
Answer» ong>Answer: The symbol is PSI (ψ) Explanation: Psi is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and MODERN Greek, the letter INDICATES the combination. For Greek loanwords in Latin and modern languages with Latin ALPHABETS, psi is usually transliterated as "PS". The letter's origin is uncertain. Hope it helps!!

28.

Which symbol is this

Answer»

ong>Answer:

The symbol is PSI (ψ)

Explanation:

Psi is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and MODERN Greek, the letter INDICATES the combination. For Greek loanwords in Latin and modern languages with Latin ALPHABETS, psi is usually transliterated as "PS". The letter's origin is uncertain.

Hope it helps!!

Discussion

29.	Which of the following statement is correct? * All metal oxides react with water to form alkalies. All metal carbonates react with water to give salt, water and carbondioxide. Some metal oxides react with water to form an acid Some metals react with water to form salt and carbon dioxide.
Answer» ong>Answer: MARK IT AS BRAINLIEST PLEASE All metal carbonates react with water to give salt, water and carbondioxide. Explanation:

29.

Which of the following statement is correct? * All metal oxides react with water to form alkalies. All metal carbonates react with water to give salt, water and carbondioxide. Some metal oxides react with water to form an acid Some metals react with water to form salt and carbon dioxide.

Answer»

ong>Answer: MARK IT AS BRAINLIEST PLEASE

All metal carbonates react with water to

give salt, water and carbondioxide.

Explanation:

Discussion

30.	Molar comductivity of NH4Cl, NaOH and NaCl at infinite dilution is 129.0, 217.0 and 106.8 ohm^-1cm^2mol^-1 respectively. Calculate the lambda(NH4OH). If molar conductivity of 10^-2M NH,OH is 9.4ohm^-1cm^-2mol^-1, calculate its degree of dissociationand dissociation constant.
Answer» ong>Answer: MARK as brainliest Explanation: ANSWER Λ m ∞ NH 4 OH=? Λ m ∞ (NH 4 Cl)=149.7 Ω −1 cm 2 mol −1 Λ m ∞ (NaOH)=248.1 Ω −1 cm 2 mol −1 Λ m ∞ (NaCl)=126.5 Ω −1 cm 2 mol −1 Λ m ∞ (NH 4 Cl)=Λ NH 4 + ∞ +Λ Cl − ∞ =149.7.....(i) Λ m ∞ NaOH=Λ Na + ∞ +Λ OH − ∞ =248.1.....(ii) Λ m ∞ NaCl=Λ Na + ∞ +Λ Cl − ∞ =126.5.....(III) Add equation (i) and (ii) and subtract equation (iii) Λ m ∞ NH 4 OH=Λ NH 4 Cl ∞ +Λ NaOH ∞ −Λ NaCl ∞ =Λ NH 4 + ∞ +Λ OH − ∞ =149.7+248.1−126.5 Λ m ∞ NH 4 OH=271.3 Ω −1 cm 2 mol −1

30.

Molar comductivity of NH4Cl, NaOH and NaCl at infinite dilution is 129.0, 217.0 and 106.8 ohm^-1cm^2mol^-1 respectively. Calculate the lambda(NH4OH). If molar conductivity of 10^-2M NH,OH is 9.4ohm^-1cm^-2mol^-1, calculate its degree of dissociationand dissociation constant.

Answer»

ong>Answer:

MARK as brainliest

Explanation:

ANSWER

Λ

m

∞

NH

4

OH=?

Λ

m

∞

(NH

4

Cl)=149.7 Ω

−1

cm

2

mol

−1

Λ

m

∞

(NaOH)=248.1 Ω

−1

cm

2

mol

−1

Λ

m

∞

(NaCl)=126.5 Ω

−1

cm

2

mol

−1

Λ

m

∞

(NH

4

Cl)=Λ

NH

4

+

∞

+Λ

Cl

−

∞

=149.7.....(i)

Λ

m

∞

NaOH=Λ

Na

+

∞

+Λ

OH

−

∞

=248.1.....(ii)

Λ

m

∞

NaCl=Λ

Na

+

∞

+Λ

Cl

−

∞

=126.5.....(III)

Add equation (i) and (ii) and subtract equation (iii)

Λ

m

∞

NH

4

OH=Λ

NH

4

Cl

∞

+Λ

NaOH

∞

−Λ

NaCl

∞

=Λ

NH

4

+

∞

+Λ

OH

−

∞

=149.7+248.1−126.5

Λ

m

∞

NH

4

OH=271.3 Ω

−1

cm

2

mol

−1

Discussion

31.	Which of the following is hydrophilic (a) Nylon (b) Polyester (c) Cotton (d) Teylene
Answer» ONG>ANSWER: A is the answer NYLON...

Discussion

32.	An element X is in group 2 of periodic table what will be the formula of its choride
Answer» MULA will be XCL2

Discussion

33.	Calculate the no. of molecules present in 2.224 dm³ of carbon dioxide at N.T.P?
Answer» ong>ANSWER: ya DHL KA ttfm is dj hm of DHN then ya AB th of Sp

33.

Calculate the no. of molecules present in 2.224 dm³ of carbon dioxide at N.T.P?

Answer»

ong>ANSWER:

ya DHL KA ttfm is dj hm of DHN then ya AB th of Sp

Discussion

34.	Explain complete reaction?
Answer» ONG>Answer: the REACTION in which amount of reactants are EQUAL and they are REACTS together with no remains then it is called COMPLETE reaction

34.

Explain complete reaction?

Answer» ONG>Answer:

the REACTION in which amount of reactants are EQUAL and they are REACTS together with no remains then it is called COMPLETE reaction

Discussion

35.	,AWKHAKJCBAKMNSX SCSFVDFVDFV DVDFVVDVNMDV DVDNFMV NVV
Answer» ONG>ANSWER:MARK IT AS BRAINLIEST PLEASE THANKS for free POINTS EXPLANATION:

35.

,AWKHAKJCBAKMNSX SCSFVDFVDFV DVDFVVDVNMDV DVDNFMV NVV

Answer» ONG>ANSWER:MARK IT AS BRAINLIEST PLEASE

THANKS for free POINTS

EXPLANATION:

Discussion

36.	Property of unit Please give me answer
Answer» ONG>Answer: u SAY about which UNIT,PLEASE say

Discussion

37.	How to synthesise aspirin from phenol
Answer» ong>Explanation: Step 1: Add sodium hydroxide to PHENOL in order to obtain sodium phenoxide ION. Step 2: Now under the high temperature and and pressure add allow phenoxde ion to react with carbon dioxide gas to give salicyclic acid . Also known as Kolbe's REACTION.

37.

How to synthesise aspirin from phenol

Answer»

ong>Explanation:

Step 1: Add sodium hydroxide to PHENOL in order to obtain sodium phenoxide ION. Step 2: Now under the high temperature and and pressure add allow phenoxde ion to react with carbon dioxide gas to give salicyclic acid . Also known as Kolbe's REACTION.

Discussion

38.	Correct the following :A molecule of sulphur is monoatomic?
Answer» ONG>Answer: A molecule of Sulphur is Diatomic. Explanation: Molecule is NOTHING but two or more than two ATOMS, so sulphur molecule cannot be MONOATOMIC, it should have more than one atom to become a molecule

38.

Correct the following :A molecule of sulphur is monoatomic?

Answer» ONG>Answer:

A molecule of Sulphur is Diatomic.

Explanation:

Molecule is NOTHING but two or more than two ATOMS, so sulphur molecule cannot be MONOATOMIC, it should have more than one atom to become a molecule

Discussion

39.	define latent heat of vaporization. What is meant by saying that the latent heat of vaporization of water is 22.5 x 100000 J/kg.if anyone will do it himself and not copy the answer from internet i will mark brainlist i will go and check if internet answer match the given answer.plz plz give the answer in ur own words.my teacher can recogonise internet answer
Answer» ong>Answer: LATENT heat of vapourisation is a physical property of a substance. When a MATERIAL in liquid state is given ENERGY, it CHANGES its phase from liquid to vapour without change in temperature, the energy absorbed in the process is called latent heat of vaporization. The latent heat of vaporization of water is about 2260kJ/Kg which is equal to 40.8kJ/mol. PLEASE FOLLOW AND MARK AS BRAINLIEST

39.

define latent heat of vaporization. What is meant by saying that the latent heat of vaporization of water is 22.5 x 100000 J/kg.if anyone will do it himself and not copy the answer from internet i will mark brainlist i will go and check if internet answer match the given answer.plz plz give the answer in ur own words.my teacher can recogonise internet answer

Answer»

ong>Answer:

LATENT heat of vapourisation is a physical property of a substance. When a MATERIAL in liquid state is given ENERGY, it CHANGES its phase from liquid to vapour without change in temperature, the energy absorbed in the process is called latent heat of vaporization. The latent heat of vaporization of water is about 2260kJ/Kg which is equal to 40.8kJ/mol.

PLEASE FOLLOW AND MARK AS BRAINLIEST

Discussion

40.	Most of substances we see around us.???
Answer» ong>Answer: Most of the substances we see AROUND us are MIXTURES of different ELEMENTS and compounds.

40.

Most of substances we see around us.???

Answer»

ong>Answer:

Most of the substances we see AROUND us are MIXTURES of different ELEMENTS and compounds.

Discussion

41.	Cacl² + 2H2O find the value
Answer» ONG>Answer: find it on doubt nout I'm sure you will get the CORRECT answer Explanation: give me a THANKS ❤️ MARK as brainliest follow me

41.

Cacl² + 2H2O find the value

Answer» ONG>Answer:

find it on doubt nout I'm sure you will get the CORRECT answer

Explanation:

give me a THANKS ❤️ MARK as brainliest follow me

Discussion

42.	The additive as well as constitutive property is
Answer» ong>Explanation: Additive property: it includes the TOTAL contribution of atoms creating a sum of all individual atoms like in MOLECULAR weight. Constitutive property: It includes the ARRANGEMENT or structure of atoms in the molecules like in electrical properties of some molecule

42.

The additive as well as constitutive property is

Answer»

ong>Explanation:

Additive property: it includes the TOTAL contribution of atoms creating a sum of all individual atoms like in MOLECULAR weight. Constitutive property: It includes the ARRANGEMENT or structure of atoms in the molecules like in electrical properties of some molecule

Discussion

43.	Why females are attractive than male in every multicellular organisms
Answer» ong>Answer: In most MULTICELLULAR species, these strategies became INEXTRICABLY mixed, and sexual behavior increasingly more – and in most species even exclusively – ‘served’ the interests of REPRODUCTION: sexual behavior became more or less SYNONYMOUS with reproductive behavior. In most species, the ‘mix’ of sexual and reproductive strategies evolved into typical gender-related patterns of behavior, that is, in typical ‘sex-roles’. Often, males are bigger and more ‘beautiful’ ( = more intensely ornamented) than females; males compete with each other for access to females; males court females, while females choose males (‘female choice’).

43.

Why females are attractive than male in every multicellular organisms

Answer»

ong>Answer:

In most MULTICELLULAR species, these strategies became INEXTRICABLY mixed, and sexual behavior increasingly more – and in most species even exclusively – ‘served’ the interests of REPRODUCTION: sexual behavior became more or less SYNONYMOUS with reproductive behavior. In most species, the ‘mix’ of sexual and reproductive strategies evolved into typical gender-related patterns of behavior, that is, in typical ‘sex-roles’. Often, males are bigger and more ‘beautiful’ ( = more intensely ornamented) than females; males compete with each other for access to females; males court females, while females choose males (‘female choice’).

Discussion

44.	लेंबर्ट बीयर नियम पर संक्षिप्त टिप्पडी लिखिए
Answer» SORRY can't UNDERSTAND MARK me as a BRAINLEST ANSWER sorry can't understand mark me as a brainlest answer

44.

लेंबर्ट बीयर नियम पर संक्षिप्त टिप्पडी लिखिए

Answer»

SORRY can't UNDERSTAND MARK me as a BRAINLEST ANSWER

sorry can't understand mark me as a brainlest answer

Discussion

45.	.Which of the following molecules /ion is non linearCS2HCNSnCl2NO2+
Answer» ong>Answer: ICI2+ has 2bond pairs and TWO lone pairs MAKING it a bent STRUCTURE and rather than the LINER. THIS HAPPENS WITH THE VSEPR THEORY

45.

.Which of the following molecules /ion is non linearCS2HCNSnCl2NO2+

Answer»

ong>Answer:

ICI2+ has 2bond pairs and TWO lone pairs MAKING it a

bent STRUCTURE and rather than the LINER. THIS HAPPENS WITH THE VSEPR THEORY

Discussion

46.	The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is____
Answer» ONG>Answer: CA(HCO3)2 is the answer

46.

The formula of sodium carbonate is Na2CO3 and that of calcium hydrogen carbonate is____

Answer» ONG>Answer:

CA(HCO3)2 is the answer

Discussion

47.	Among the element b,ai,c,si which has fhe largest atamic radius and why
Answer» ong>Answer: The largest atomic radius will be FOUND in aluminium (Al)as it is the metal of second GROUP whose METALLIC character is larger than silicon & so it has larger radius. (Atomic radius INCREASES down the group). mark me as brainliest...........

47.

Among the element b,ai,c,si which has fhe largest atamic radius and why

Answer»

ong>Answer:

The largest atomic radius will be FOUND in aluminium (Al)as it is the metal of second GROUP whose METALLIC character is larger than silicon & so it has larger radius. (Atomic radius INCREASES down the group).

mark me as brainliest...........

Discussion

48.	Zncl² + 2H2O find the value
Answer» this????????????????????

Discussion

49.	The compound which contains only covalent bond is 1.KCN 2.Nh4cl 3.pcl5 4.h2o2
Answer» ER:PCL5 contain only covalent bond Explanation:PCL5 is covalent bond and it can SHARE 5 electrons

49.

The compound which contains only covalent bond is 1.KCN 2.Nh4cl 3.pcl5 4.h2o2

Answer» ER:PCL5 contain only covalent bond

Explanation:PCL5 is covalent bond and it can SHARE 5 electrons

Discussion

50.	Explain avogadro law.
Answer» ong>Answer: Avogadro's law is an EXPERIMENTAL gas law relating the volume of a gas to the amount of SUBSTANCE of gas present. The law is a specific case of the ideal gas law. A MODERN statement is: Avogadro's law states that "equal volumes of all gases, at the same temperature and PRESSURE, have the same number of molecules. Explanation: thank you ❤️ don't forget to follow me

50.

Explain avogadro law.

Answer»

ong>Answer:

Avogadro's law is an EXPERIMENTAL gas law relating the volume of a gas to the amount of SUBSTANCE of gas present. The law is a specific case of the ideal gas law. A MODERN statement is: Avogadro's law states that "equal volumes of all gases, at the same temperature and PRESSURE, have the same number of molecules.

Explanation:

thank you ❤️

don't forget to follow me

Discussion

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,AWKHAKJCBAKMNSX SCSFVDFVDFV DVDFVVDVNMDV DVDNFMV NVV

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Explain avogadro law.