52639 + Interview Questions in Secondary School in Chemistry

1.	In a chemical reaction between sulphuric acid and Barium chloride solution the white precipitate formed are
Answer» ANSWER: H2SO4 +bacl2 =baso4 +2HCL mark me as BRAINLIEST you will get 3 MARKS

1.

In a chemical reaction between sulphuric acid and Barium chloride solution the white precipitate formed are

Answer»

ANSWER:

H2SO4 +bacl2 =baso4 +2HCL mark me as BRAINLIEST you will get 3 MARKS

Discussion

2.	40g of a carbonate of an alkali metal or alkaline earth metal containing some inert impurities was made to react with excess HClsolution. The liberated CO2 occupied 12.315L at 1atm and 300K.What is the no of moles
Answer» Answer: 18 40 gm of a CARBONATE of an alkali metal or ALKALINE earth metal CONTAINING some inert impurities was made to react with excess HCl solution The liberated

2.

40g of a carbonate of an alkali metal or alkaline earth metal containing some inert impurities was made to react with excess HClsolution. The liberated CO2 occupied 12.315L at 1atm and 300K.What is the no of moles

Answer»

Answer:

18 40 gm of a CARBONATE of an alkali metal or ALKALINE earth metal CONTAINING some inert impurities was made to react with excess HCl solution The liberated

Discussion

3.	The wave number of a wave having wavelength 10^8 m is
Answer» Answer: 10^(-8) m Explanation: WAVE no. = 1 / wavelength Given wavelength = 10^8 m wave no. = 1 / 10^8 m = 10^(-8) m

3.

The wave number of a wave having wavelength 10^8 m is

Answer»

Answer:

10^(-8) m

Explanation:

WAVE no. = 1 / wavelength

Given wavelength = 10^8 m

wave no. = 1 / 10^8 m

= 10^(-8) m

Discussion

4.	Write full explanation plz give answer fast
Answer» Answer: the answer is (1) 6.8x10 cm/sec Explanation: why उत्तर संख्या एक है, मुझे लगता है कि उत्तर संख्या एक क्यों, क्योंकि ऐसा लगता है कि यह सबसे अधिक उत्तर है और यह मेरे लिए सबसे अधिक समझ में आता है इसलिए मैंने उस उत्तर को चुना है और मुझे आशा है कि आप मुझे एक बुद्धिहीन के रूप में चुनेंगे क्योंकि मैं हूं खुश होने जा रहा हूं और आप इसे लेने के बारे में बहुत खुश होने जा रहे हैं, लेकिन क्या आप कृपया मुझे खुश कर सकते हैं कृपया मुझे प्रकाश से पांच दें जो मैं बहुत खुश हूं कि आप ऐसा करने जा रहे हैं और मुझे उम्मीद है कि इस तरफ अपनी चीज के लिए काम करो uttar sankhya ek hai, mujhe lagata hai ki uttar sankhya ek kyon, kyonki aisa lagata hai ki yah sabase adhik uttar hai aur yah mere LIE sabase adhik samajh mein aata hai isalie mainne us uttar ko chuna hai aur mujhe aasha hai ki aap mujhe ek buddhiheen ke roop mein chunenge kyonki main hoon khush hone ja raha hoon aur aap ise lene ke baare mein bahut khush hone ja rahe hain, LEKIN kya aap krpaya mujhe khush kar sakate hain krpaya mujhe prakaash se paanch DEN JO main bahut khush hoon ki aap aisa karane ja rahe hain aur mujhe ummeed hai ki is taraph apanee cheej ke lie KAAM karo

4.

Write full explanation plz give answer fast

Answer»

Answer:

the answer is (1) 6.8x10 cm/sec

Explanation:

why

उत्तर संख्या एक है, मुझे लगता है कि उत्तर संख्या एक क्यों, क्योंकि ऐसा लगता है कि यह सबसे अधिक उत्तर है और यह मेरे लिए सबसे अधिक समझ में आता है इसलिए मैंने उस उत्तर को चुना है और मुझे आशा है कि आप मुझे एक बुद्धिहीन के रूप में चुनेंगे क्योंकि मैं हूं खुश होने जा रहा हूं और आप इसे लेने के बारे में बहुत खुश होने जा रहे हैं, लेकिन क्या आप कृपया मुझे खुश कर सकते हैं कृपया मुझे प्रकाश से पांच दें जो मैं बहुत खुश हूं कि आप ऐसा करने जा रहे हैं और मुझे उम्मीद है कि इस तरफ अपनी चीज के लिए काम करो

uttar sankhya ek hai, mujhe lagata hai ki uttar sankhya ek kyon, kyonki aisa lagata hai ki yah sabase adhik uttar hai aur yah mere LIE sabase adhik samajh mein aata hai isalie mainne us uttar ko chuna hai aur mujhe aasha hai ki aap mujhe ek buddhiheen ke roop mein chunenge kyonki main hoon khush hone ja raha hoon aur aap ise lene ke baare mein bahut khush hone ja rahe hain, LEKIN kya aap krpaya mujhe khush kar sakate hain krpaya mujhe prakaash se paanch DEN JO main bahut khush hoon ki aap aisa karane ja rahe hain aur mujhe ummeed hai ki is taraph apanee cheej ke lie KAAM karo

Discussion

5.	What are the different types of separation of mixtures
Answer» ANSWER: METHODS of SEPARATION of MIXTURES are 1.winnowing 2.threshing 3.hand PICKING

5.

What are the different types of separation of mixtures

Answer»

ANSWER:

METHODS of SEPARATION of MIXTURES are

1.winnowing

2.threshing

3.hand PICKING

Discussion

6.	2-methylbut-2-ene + potassium manganate
Answer» 2-methylbut-2-ene + POTASSIUM MANGANATE ----------> 2,4,3 potassium permagnetile.

Discussion

7.	state the chemical name of plaster of paris write a chemical equation to show the reaction between Plaster of Paris and water
Answer» Answer: Chemical name of plaster of paris- CALCIUM Sulphate. Chemical EQUATION for reaction between pop and WATER- CASO4.1/2 H2O + 1 1/2 H2O⇒ CaSO4. 2H2O Explanation: HOPE. understood Mark me the BRAINLIEST......

7.

state the chemical name of plaster of paris write a chemical equation to show the reaction between Plaster of Paris and water

Answer»

Answer:

Chemical name of plaster of paris- CALCIUM Sulphate.

Chemical EQUATION for reaction between pop and WATER-

CASO4.1/2 H2O + 1 1/2 H2O⇒ CaSO4. 2H2O

Explanation:

HOPE. understood

Mark me the BRAINLIEST......

Discussion

8.	To protect tooth decay we are advised to brush our teeth regularly. The nature of tooth paste used is acidic neutral basic corrosive
Answer» ANSWER: it is WEAKLY BASIC in NATURE

8.

To protect tooth decay we are advised to brush our teeth regularly. The nature of tooth paste used is acidic neutral basic corrosive

Answer»

ANSWER:

it is WEAKLY BASIC in NATURE

Discussion

9.	Balance the following chemical equations. a) Ba Cl2 + H2SO4  BaSO4 + HCl. b) Calcium hydroxide + Carbon dioxide  Calcium carbonate + Water. c) Aluminum + Copper chloride  Copper + Aluminum chloride d) Sulphur dioxide + Oxygen  Sulphur trioxide e) NH3+ CuO  Cu + N2 + H2O answer this and i will mark you as brainliest
Answer» Answer: BACL 2 Explanation: bacl2 +H2SO4 =baso4 +2(hcl) and then 2nd is CA(oh)2+co2=caco3+h20 and 3rd is 2Al+3(cucl2)=3cu +2(alcl3) and 4 th is 2(so2)+o2=2(si3) and 5th is 2(Nh3)+3cuo=3cu+N2+3(h2o) finish it takes much time pleas MARK me as brainliest you will get 3 points

9.

Balance the following chemical equations. a) Ba Cl2 + H2SO4  BaSO4 + HCl. b) Calcium hydroxide + Carbon dioxide  Calcium carbonate + Water. c) Aluminum + Copper chloride  Copper + Aluminum chloride d) Sulphur dioxide + Oxygen  Sulphur trioxide e) NH3+ CuO  Cu + N2 + H2O answer this and i will mark you as brainliest

Answer»

Answer:

BACL 2

Explanation:

bacl2 +H2SO4 =baso4 +2(hcl) and then 2nd is CA(oh)2+co2=caco3+h20 and 3rd is 2Al+3(cucl2)=3cu +2(alcl3) and 4 th is 2(so2)+o2=2(si3) and 5th is 2(Nh3)+3cuo=3cu+N2+3(h2o) finish it takes much time pleas MARK me as brainliest you will get 3 points

Discussion

10.	KMno4 can oxidise No2- to No3- in basic medium how many miles of No2- are oxidise by one mole of KMno4-
Answer» Answer: Chuck I have the led by future and we will have the call of HI I have the led by a third of hi dad I am so excited to SEE you soon my number is mean to see the ATTACHED RESUME of hi dad I am sandhiya saru frnd

10.

KMno4 can oxidise No2- to No3- in basic medium how many miles of No2- are oxidise by one mole of KMno4-

Answer»

Answer:

Chuck I have the led by future and we will have the call of HI I have the led by a third of hi dad I am so excited to SEE you soon my number is mean to see the ATTACHED RESUME of hi dad I am sandhiya saru frnd

Discussion

11.	(23)What will be mole fraction of glycerine in solution containing 46 g glycerine (M = 92 u) and 36 gwater?(a) 0.4(b) 0.46(c) 0.20(d) 0.36
Answer» EXPLANATION: PLS MARK me as BRAINLIST.

11.

(23)What will be mole fraction of glycerine in solution containing 46 g glycerine (M = 92 u) and 36 gwater?(a) 0.4(b) 0.46(c) 0.20(d) 0.36

Answer»

EXPLANATION:

PLS MARK me as BRAINLIST.

Discussion

12.	Calculate the number of Cu atoms in 0.3175g of Cu?
Answer» ANSWER: I HOPE it will HELP you....

12.

Calculate the number of Cu atoms in 0.3175g of Cu?

Answer»

ANSWER:

I HOPE it will HELP you....

Discussion

13.	K2cr2o7+h2so4+ch3cho=k2so4+cr2 (so4)3+h2o+ch3coo balance it please .
Answer» ANSWER: I don't UNDERSTAND this PLEASE MAKE a PHOTO of it

13.

K2cr2o7+h2so4+ch3cho=k2so4+cr2 (so4)3+h2o+ch3coo balance it please .

Answer»

ANSWER:

I don't UNDERSTAND this PLEASE MAKE a PHOTO of it

Discussion

14.	Comparison between Hoffmann and saytzeff elimination reaction
Answer» The Hofmann Elimination is an elimination reaction of ALKYLAMMONIUM SALTS that FORMS C-C double bonds [pi bonds]. ... In contrast with most elimination reactions that yield alkenes, which follow the ZAITSEV (Saytzeff) RULE, the Hofmann elimination tends to provide the less substituted alkene.

14.

Comparison between Hoffmann and saytzeff elimination reaction

Answer»

The Hofmann Elimination is an elimination reaction of ALKYLAMMONIUM SALTS that FORMS C-C double bonds [pi bonds]. ... In contrast with most elimination reactions that yield alkenes, which follow the ZAITSEV (Saytzeff) RULE, the Hofmann elimination tends to provide the less substituted alkene.

Discussion

15.	Best definition of electron gain enthalpy
Answer» Explanation: ELECTRON gain enthalpy is defined as the AMOUNT of ENERGY released when an electron is ADDED to an isolated GASEOUS atom. During the addition of an electron, energy can either be released or absorbed. please mark me brainlist.

15.

Best definition of electron gain enthalpy

Answer»

Explanation:

ELECTRON gain enthalpy is defined as the AMOUNT of ENERGY released when an electron is ADDED to an isolated GASEOUS atom. During the addition of an electron, energy can either be released or absorbed.

please mark me brainlist.

Discussion

16.	which of the following is not an example of a combination reaction 1) 2H²O = 2H²O , 2) AgNO³ + NaCL = AgCL + NaNO³ , 3) 2Mg + O² = 2MgO
Answer» Answer: 2nd is double DISPLACEMENT REACTION and 3RD is the combination reaction please mark me as brainlest you will get 3 points

16.

which of the following is not an example of a combination reaction 1) 2H²O = 2H²O , 2) AgNO³ + NaCL = AgCL + NaNO³ , 3) 2Mg + O² = 2MgO

Answer»

Answer:

2nd is double DISPLACEMENT REACTION and 3RD is the combination reaction please mark me as brainlest you will get 3 points

Discussion

17.	an aqueous solution boils at 100.512 degree Celsius. The freezing point of solution is Kf is 1.86 KKg per mol , Kb is 0.512 KKg per mol
Answer» ANSWER: EXPLANATION: −0.544∘C −0.512∘C −0.272∘C −1.86∘C Answer : C Solution : 0.15=0.512xm,m'=12(0.150.512) ΔTf=1.86×0.150.512×12 Tf=−0.272∘C

17.

an aqueous solution boils at 100.512 degree Celsius. The freezing point of solution is Kf is 1.86 KKg per mol , Kb is 0.512 KKg per mol

Answer»

ANSWER:

EXPLANATION:

−0.544∘C

−0.512∘C

−0.272∘C

−1.86∘C

Answer :

C

Solution :

0.15=0.512xm,m'=12(0.150.512)

ΔTf=1.86×0.150.512×12

Tf=−0.272∘C

Discussion

18.	Write the electronic configuration of na,o.why they form compounds
Answer» The ELECTRONIC CONFIGURATION of NA,o is [NE] 3s¹

Discussion

19.	I will mark u BRAINLIEST IF U GIVE CORRECT ANS A silver coin contains 50% of silver. the no. of Ag atoms present in 21.6 g of silver coin
Answer» Answer: I will mark u BRAINLIEST IF U GIVE CORRECT ANS A silver COIN contains 50% of silver. the no. of AG atoms present in 21.6 G of silver coin

19.

I will mark u BRAINLIEST IF U GIVE CORRECT ANS A silver coin contains 50% of silver. the no. of Ag atoms present in 21.6 g of silver coin

Answer»

Answer:

I will mark u BRAINLIEST IF U GIVE CORRECT ANS A silver COIN contains 50% of silver. the no. of AG atoms present in 21.6 G of silver coin

Discussion

20.	Give the names of three atomic species of hydrogen.
Answer» ANSWER: idk Explanation:

20.

Give the names of three atomic species of hydrogen.

Answer»

ANSWER:

idk

Explanation:

Discussion

21.	. Assertion: Isotonic solutions do not show phenomenon ofosmosis.Reason: Isotonic solutions have same molar concentrationat same temperature.
Answer» Answer: ISOTONIC solutions have equal osmotic pressure so they do not show osmosis. So Both (R) and (A) are true and reason is the. CORRECT EXPLANATION of assertion. Hence OPTION A is correct.

21.

. Assertion: Isotonic solutions do not show phenomenon ofosmosis.Reason: Isotonic solutions have same molar concentrationat same temperature.

Answer»

Answer:

ISOTONIC solutions have equal osmotic pressure so they do not show osmosis.

So Both (R) and (A) are true and reason is the. CORRECT EXPLANATION of assertion.

Hence OPTION A is correct.

Discussion

22.	How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization enthalpy of H atom ( energy required to remove the electron from n = 1 orbit). Please answer it and explain me in an easier way cause I'm not able to understand it.
Answer» PLZ REFER The ATTACHMENT Dear ☺❤❤

22.

How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization enthalpy of H atom ( energy required to remove the electron from n = 1 orbit). Please answer it and explain me in an easier way cause I'm not able to understand it.

Answer»

PLZ REFER The ATTACHMENT Dear ☺❤❤

Discussion

23.	Sprinkling salt on ice leads to
Answer» Ur ANSWER will be: When added to ice, salt FIRST dissolves in the FILM of liquid water that is always present on the surface, THEREBY lowering its freezing POINT below the ice temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt and so on Plzz follow me Mark as brainliest

23.

Sprinkling salt on ice leads to

Answer»

Ur ANSWER will be:

When added to ice, salt FIRST dissolves in the FILM of liquid water that is always present on the surface, THEREBY lowering its freezing POINT below the ice temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt and so on

Plzz follow me

Mark as brainliest

Discussion

24.	Assertion: An ideal solution obeys Raoult's law.Reason: In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solventinteractions.
Answer» ANSWER: If both assertion and reason are true and reason correct explanation of assertion. Explanation: An ideal SOLUTION OBEYS Raoult's law. In an ideal solution, solute-solute as well as solvent-solvent INTERACTIONS are similar to solute-solvent interactions.

24.

Assertion: An ideal solution obeys Raoult's law.Reason: In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solventinteractions.

Answer»

ANSWER:

If both assertion and reason are true and reason correct explanation of assertion.

Explanation:

An ideal SOLUTION OBEYS Raoult's law. In an ideal solution, solute-solute as well as solvent-solvent INTERACTIONS are similar to solute-solvent interactions.

Discussion

25.	Which is not an acidic salt
Answer» Hey mate, NaH2PO2 is not an ACIDIC salt. Explaination: it is a basic-natured salt because It does not have any acidic HYDROGEN. So, it is a NORMAL sodium salt of PHOSPHORUS acid.

25.

Which is not an acidic salt

Answer»

Hey mate,

NaH2PO2 is not an ACIDIC salt.

Explaination: it is a basic-natured salt because

It does not have any acidic HYDROGEN. So, it is a NORMAL sodium salt of PHOSPHORUS acid.

Discussion

26.	Suggest four practical strategies that you can use to prevent spreading false news about a life-threatening illness such as COVID 19. Motivate every answer
Answer» SPREAD awareness among the people. It's the most IMPORTANT thing.

Discussion

27.	Reason". Assertion: Larger the value of cryoscopic constant of thesolvent, lesser will be the freezing point of the solution.Reason: Depression in the freezing point depends on thenature of the solvent.
Answer» Answer: Reason (R ): DEPRESSION in the freezing point depends on the NATURE of the SOLVENT. ... of CRYOSCOPIC constant of the solvent, lesser will be the freezing point

27.

Reason". Assertion: Larger the value of cryoscopic constant of thesolvent, lesser will be the freezing point of the solution.Reason: Depression in the freezing point depends on thenature of the solvent.

Answer»

Answer:

Reason (R ): DEPRESSION in the freezing point depends on the NATURE of the SOLVENT. ... of CRYOSCOPIC constant of the solvent, lesser will be the freezing point

Discussion

28.	- Assertion: Water boiling at 100°C at 1 atmospherepressure in a beaker is not at equilibrium.Reason: It refers to an open system,bevolue of evocconic constant
Answer» ANSWER: both are CORRECT ssssss

28.

- Assertion: Water boiling at 100°C at 1 atmospherepressure in a beaker is not at equilibrium.Reason: It refers to an open system,bevolue of evocconic constant

Answer»

ANSWER:

both are CORRECT ssssss

Discussion

29.	Give the difference between three sub-atomic particles.
Answer» ANSWER: PLEASE MARK as BRAINLIEST answer

29.

Give the difference between three sub-atomic particles.

Answer»

ANSWER:

PLEASE MARK as BRAINLIEST answer

Discussion

30.	Write the electronic configuration of noble gases.on this basis explain why they do not taking part in chemical reaction?
Answer» ANSWER: idk Explanation:

30.

Write the electronic configuration of noble gases.on this basis explain why they do not taking part in chemical reaction?

Answer»

ANSWER:

idk

Explanation:

Discussion

31.	1. 12g of urea is dissolved in 1 litre of water and 68.4 g ofsucrose is dissolved in llitre of water. The lowering ofvapour pressure of first case is:a. Equal to secondb. Greater than secondc. Less than secondd. Double that of second
Answer» Answer: 8yxyoc9yxyox9xtx9cy9cyoc9yx,

31.

1. 12g of urea is dissolved in 1 litre of water and 68.4 g ofsucrose is dissolved in llitre of water. The lowering ofvapour pressure of first case is:a. Equal to secondb. Greater than secondc. Less than secondd. Double that of second

Answer»

Answer:

8yxyoc9yxyox9xtx9cy9cyoc9yx,

Discussion

32.	21)TUJU.23 V2 molal NaOH solution has temperature 298 K. if temperature of the solution is 323 K. concentrationwill be(a) 2m(b) 4 m(c) 3 m(d) 0.2 m
Answer» QUESTION : 2 molal NaOH solution has TEMPERATURE 298 K. if temperature of the solution is 323 K. concentration GIVEN : Molality (m 1 ) = 2 m Temperature (T 1 ) = 298 K Temperature ( T 2 ) = 323 K SOLUTION : As PER the FORMULA , molality = moles of solute / mass of the solvent mass doesn't DEPEND upon temperature hence ,molality also doesn't depend upon temperature hence , at 323 K the molality remains the same molality ( m 2 ) = 2 m ANSWER : molality = 2 m

32.

21)TUJU.23 V2 molal NaOH solution has temperature 298 K. if temperature of the solution is 323 K. concentrationwill be(a) 2m(b) 4 m(c) 3 m(d) 0.2 m

Answer»

QUESTION :

2 molal NaOH solution has TEMPERATURE 298 K. if temperature of the solution is 323 K. concentration

GIVEN :

Molality (m 1 ) = 2 m
Temperature (T 1 ) = 298 K
Temperature ( T 2 ) = 323 K

SOLUTION :

As PER the FORMULA ,

molality = moles of solute / mass of the solvent

mass doesn't DEPEND upon temperature

hence ,molality also doesn't depend upon temperature

hence , at 323 K the molality remains the same

molality ( m 2 ) = 2 m

ANSWER :

molality = 2 m

Discussion

33.	I follow a Chemistry Book for Class XI and there it is given that- "The Protons primarily carry a unit positive charge. However, they can also be of charges +2, +3, etc." How is that even possible??? I mean a proton can have a charge greater than +1?? And if it is true, can a proton have a charge lesser than +1??
Answer» ANSWER: sorry I am in class 8 so I can't answer QUESTION of class 11

33.

I follow a Chemistry Book for Class XI and there it is given that- "The Protons primarily carry a unit positive charge. However, they can also be of charges +2, +3, etc." How is that even possible??? I mean a proton can have a charge greater than +1?? And if it is true, can a proton have a charge lesser than +1??

Answer»

ANSWER:

sorry I am in class 8 so I can't answer QUESTION of class 11

Discussion

34.	Ozone molecule splits at 242nm.(T)(F)
Answer» ANSWER: it is False Explanation:

34.

Ozone molecule splits at 242nm.(T)(F)

Answer»

ANSWER:

it is False

Explanation:

Discussion

35.	Zeff to 3d electrons of manganese is Please answer I need it urgent
Answer» SORRY I can't UNDERSTAND this QUESTION

35.

Zeff to 3d electrons of manganese is Please answer I need it urgent

Answer»

SORRY I can't UNDERSTAND this QUESTION

Discussion

36.	The freezing point depression constant for water is-1.86°C m'. I 5.00g Na, So, is dissolved in 45,0 g H,O,the freezing point is changed by -3.82°C. Calculate thevan 't Hoff factor for Na, SO,a. 2.05b. 2.63c. 3.11d. 0.381
Answer» Answer: If 5.00 G Na2SO4 is DISSOLVED in 45.0 g H2O, the freezing point is changed by -3.82oC. CALCULATE the van't. Hoff factor for Na2SO4.

36.

The freezing point depression constant for water is-1.86°C m'. I 5.00g Na, So, is dissolved in 45,0 g H,O,the freezing point is changed by -3.82°C. Calculate thevan 't Hoff factor for Na, SO,a. 2.05b. 2.63c. 3.11d. 0.381

Answer»

Answer:

If 5.00 G Na2SO4 is DISSOLVED in 45.0 g H2O, the freezing point is changed by -3.82oC. CALCULATE the van't. Hoff factor for Na2SO4.

Discussion

37.	Which postulate of Dalton atomic theory can explain the law of definite proportion ??
Answer» ☛ Law of definite proportion states that "the elements are ALWAYS present in definite proportions by mass." And we know that the last POSTULATE of Dalton's atomic theory which states that, "In a given compound, the relative NUMBER and types of ATOMS are constant." Pls mark as brainlist ❤

37.

Which postulate of Dalton atomic theory can explain the law of definite proportion ??

Answer»

☛ Law of definite proportion states that "the elements are ALWAYS present in definite proportions by mass." And we know that the last POSTULATE of Dalton's atomic theory which states that, "In a given compound, the relative NUMBER and types of ATOMS are constant."

Pls mark as brainlist ❤

Discussion

38.	Convert following temperature to degree Celsius 104°F
Answer» Answer: CONVERT 104° F to the CELSIUS scale. Subtract 32 from the degrees. Multiply the result by 5. Divide the PRODUCT by 9.

38.

Convert following temperature to degree Celsius 104°F

Answer»

Answer:

CONVERT 104° F to the CELSIUS scale. Subtract 32 from the degrees. Multiply the result by 5. Divide the PRODUCT by 9.

Discussion

39.	NaOH & Na2CO3 are dissolved in 200ml of solution in presence of phenolphthalein 17.5ml 0.1 N of HCl is used to titrate the solution. Methyl orange added to same solution and requires 2.5ml 0.1 N HCl calculate the normality of NaOH and Na2CO3
Answer» ANSWER: Estimation of Na2CO3 and NaHCO3 in a MIXTURE: Accurately weigh about 2.0 g of the mixture and PREPARE a solution in distilled WATER in a 250 ml standard flask. Slowly titrate 25 ml of this solution against standard hydrochloric acid using PHENOLPHTHALEIN as indicator. Repeat to concordance (Vp ml). Explanation: please mark me as BRAINLIEST

39.

NaOH & Na2CO3 are dissolved in 200ml of solution in presence of phenolphthalein 17.5ml 0.1 N of HCl is used to titrate the solution. Methyl orange added to same solution and requires 2.5ml 0.1 N HCl calculate the normality of NaOH and Na2CO3

Answer»

ANSWER:

Estimation of Na2CO3 and NaHCO3 in a MIXTURE: Accurately weigh about 2.0 g of the mixture and PREPARE a solution in distilled WATER in a 250 ml standard flask. Slowly titrate 25 ml of this solution against standard hydrochloric acid using PHENOLPHTHALEIN as indicator. Repeat to concordance (Vp ml).

Explanation:

please mark me as BRAINLIEST

Discussion

40.	A solution contains 60 g of glucose, 40 g of salt in 1 litre of water. Calculate the mass per cent of (a) glucose (b) salt (density of water = 1 g /mL).
Answer» ANSWER: ANS. IS BELOW : Explanation: The solution contain 30g glucose , 20 g salt and 500g water(density of water = 1g/ml so 500ML= 500g) Total weight of solution by mass = 30g + 20g + 500 g = 550g Mass % of glucose = 30/ 550 100 = 5.45 % Mass % of salt = 20 /550 100 = 3.63% THANK YOU

40.

A solution contains 60 g of glucose, 40 g of salt in 1 litre of water. Calculate the mass per cent of (a) glucose (b) salt (density of water = 1 g /mL).

Answer»

ANSWER:

ANS. IS BELOW :

Explanation:

The solution contain 30g glucose , 20 g salt and 500g water(density of water = 1g/ml so 500ML= 500g)

Total weight of solution by mass = 30g + 20g + 500 g = 550g

Mass % of glucose = 30/ 550 *100 = 5.45 %

Mass % of salt = 20 /550 *100 = 3.63%

THANK YOU

Discussion

41.	What type of magnetic behaviour is shown by CU + 2 Ion copper iron
Answer» FERROMAGNETISM is SHOWN .

Discussion

42.	(C)V.0) What will be normality of 250 ml solution of H2SO4, having the value of pH = 0 ?(d) 0.14(a) 2 N(b) 1 N(c) 0.5 N(d) 0.25 N2 molal NaOH solution has temperature 298 K. if temperature of the solution is 323 K, co1)
Answer» EXPLANATION: HI PLS MARK as BRAINLIEST

42.

(C)V.0) What will be normality of 250 ml solution of H2SO4, having the value of pH = 0 ?(d) 0.14(a) 2 N(b) 1 N(c) 0.5 N(d) 0.25 N2 molal NaOH solution has temperature 298 K. if temperature of the solution is 323 K, co1)

Answer»

EXPLANATION:

HI PLS MARK as BRAINLIEST

Discussion

43.	Suppose the energy at fourth level of the h atom is -50 arbitrary units then the ionization energy is
Answer» Answer: AB YAAR AAP bhi question puchoge PEHLE mujhe follow karo

43.

Suppose the energy at fourth level of the h atom is -50 arbitrary units then the ionization energy is

Answer»

Answer:

AB YAAR AAP bhi question puchoge PEHLE mujhe follow karo

Discussion

44.	Is vanila essence acidic or basic
Answer» Answer: *HEYAA!! vanila* *essence* is *basic* in *medium. ^( HOPE* it *helps* *you* *BUDDY* )))

44.

Is vanila essence acidic or basic

Answer»

Answer:

HEYAA!!

vanila essence is basic in medium.

^( HOPE it helps you BUDDY )))

Discussion

45.	What are the structures with charges on I of IF4+ and IF4-
Answer» Explanation: IF4 (iodine tetrafluoride) has an OCTAHEDRAL electron GEOMETRY, but the molecular geometry STATES that the ATOMS take a square planar SHAPE. This is because iodine carries two lone pairs, one above and below the plane on the x-axis

45.

What are the structures with charges on I of IF4+ and IF4-

Answer»

Explanation:

IF4 (iodine tetrafluoride) has an OCTAHEDRAL electron GEOMETRY, but the molecular geometry STATES that the ATOMS take a square planar SHAPE. This is because iodine carries two lone pairs, one above and below the plane on the x-axis

Discussion

46.	Find the proportionate masses of Sulphur and sulphur dioxide
Answer» ANSWER: Explanation: the mass is sulphur is 32 the mass of sulpur DIOXIDE (so2)= 32 + 32 = 64 . DIVIDING them for RATIO therefore 32/64 =1:2

46.

Find the proportionate masses of Sulphur and sulphur dioxide

Answer»

ANSWER:

Explanation:

the mass is sulphur is 32

the mass of sulpur DIOXIDE (so2)= 32 + 32 = 64 .

DIVIDING them for RATIO therefore

32/64 =1:2

Discussion

47.	Why are the electric wires covered with plastic?
Answer» ANSWER: because PLASTIC is not a CONTACTOR of ELECTRICITY

47.

Why are the electric wires covered with plastic?

Answer»

ANSWER:

because PLASTIC is not a CONTACTOR of ELECTRICITY

Discussion

48.	Aniline to o-dichlorobenzene
Answer» Answer: 1st do CHLORINATION of aniline by using FECL3 catalyst. Then CARRY out diazotisation reaction. Then react the compound with Cu2Cl2. Explanation: 1st step will GIVE you o-chloro aniline 2nd step coverts NH2 to N2Cl 3rs step converts N2Cl to Cl. Finally you obtain the required product

48.

Aniline to o-dichlorobenzene

Answer»

Answer:

1st do CHLORINATION of aniline by using FECL3 catalyst. Then CARRY out diazotisation reaction. Then react the compound with Cu2Cl2.

Explanation:

1st step will GIVE you o-chloro aniline

2nd step coverts NH2 to N2Cl

3rs step converts N2Cl to Cl.

Finally you obtain the required product

Discussion

49.	Carbonic acid is because ofnitrogenoxides in the atmosphere(T) (F)
Answer» Answer: TRUE is this HELPFUL or not EXPLANATION: plz TELL me

49.

Carbonic acid is because ofnitrogenoxides in the atmosphere(T) (F)

Answer»

Answer:

TRUE is this HELPFUL or not

EXPLANATION:

plz TELL me

Discussion

50.	Which element is used to fill electric bulbs and tubes?
Answer» Answer: argon Explanation: Argon is used to fill incandescent light bulbs to INHIBIT the EVAPORATION of the tungsten filaments and increase bulb life. XENON is used in electronic flash tubes for cameras and other flash tubes. i hope it HELPED u ******************

50.

Which element is used to fill electric bulbs and tubes?

Answer»

Answer:

argon

Explanation:

Argon is used to fill incandescent light bulbs to INHIBIT the EVAPORATION of the tungsten filaments and increase bulb life. XENON is used in electronic flash tubes for cameras and other flash tubes.

i hope it HELPED u

******************

Discussion

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HEYAA!!

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^( HOPE it helps you BUDDY )))

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