15280 + Interview Questions in Chemistry Page 113 InterviewSolution

5601.

For Frost, what do ‘fire’ and ‘ice’ stand for? Here are some ideas:GreedAvariceCrueltyLustConflictFuryIntolerance RigidityInsensitivity Coldness Indifference Hatred

Answer»

For Frost, what do ‘fire’ and ‘ice’ stand for? Here are some ideas:

Greed	Avarice	Cruelty	Lust
Conflict	Fury	Intolerance	Rigidity
Insensitivity	Coldness	Indifference	Hatred

Discussion

5602.	Describe the Ostwald's process for the manufacture of nitric acid with labelled diagram.
Answer» Describe the Ostwald's process for the manufacture of nitric acid with labelled diagram.

Discussion

5603.	You probably heard that Faraday was Davy's assistant in his early days. They once had a competition of electrolysis. The winner is decided by the one who gets higher amount of metal to be deposited. They both passed the same amount of current for the same amount of time. Faraday used Silver and Davy used Copper. Who won? (Atomic weight of silver = 108gm, Atomic weight of copper = 63.6 gm)
Answer» You probably heard that Faraday was Davy's assistant in his early days. They once had a competition of electrolysis. The winner is decided by the one who gets higher amount of metal to be deposited. They both passed the same amount of current for the same amount of time. Faraday used Silver and Davy used Copper. Who won? (Atomic weight of silver = 108gm, Atomic weight of copper = 63.6 gm)

Discussion

5604.	42. Prove that the density of oxygen gas at NTP is 1.429 g/l.
Answer» 42. Prove that the density of oxygen gas at NTP is 1.429 g/l.

Discussion

5605.

Four students, (A), (B), (C) and (D) observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✓) represents 'soluble', and cross mark (×) represents 'insoluble' in carbon disulphide. Their observations are tabulated below : Student Colour Solubility in carbon disulphide Fe S FeS Fe S FeS (A) (B) (C) (D) Yellow Silvery Grey Silvery Silvery Orange Yellow White Greyish silver Reddish brown Greyish black Silvery white (✓) (×) (×) (✓) (×) (✓) (✓) (×) (✓) (✓) (×) (×) The student, who correctly reported the observation, is student :(1) (A)(2) (B)(3) (C) (4) (D)

Answer» Four students, (A), (B), (C) and (D) observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✓) represents 'soluble', and cross mark (×) represents 'insoluble' in carbon disulphide. Their observations are tabulated below :

Student	Colour			Solubility in carbon disulphide
Student	Fe	S	FeS	Fe	S	FeS
(A) (B) (C) (D)	Yellow Silvery Grey Silvery	Silvery Orange Yellow White	Greyish silver Reddish brown Greyish black Silvery white	(✓) (×) (×) (✓)	(×) (✓) (✓) (×)	(✓) (✓) (×) (×)

The student, who correctly reported the observation, is student :

(1) (A)

(2) (B)

(3) (C)

(4) (D)

Discussion

5606.	Na+ has completely filled K and L shells. Explain.
Answer» Na $^{+}$ has completely filled K and L shells. Explain.

Discussion

5607.	in the electrolysis of alkaline water a total of 1 mol of gases is evolved. the amount of water decomposed would
Answer» in the electrolysis of alkaline water a total of 1 mol of gases is evolved. the amount of water decomposed would

Discussion

5608.	What is the product of 3x,2xy and 15
Answer» What is the product of 3x,2xy and 15

Discussion

5609.	Why cl has more electron gain enthelpy than f? Electron gain enthelpy is inversily praportional to size, so f has smaller size than cl and electron gain enthelpy also decrease down the group.so f should have more electron gain enthelpy than cl electron gain enthelpy is amount of energy released or absorbed on addition of an electron,do due to smaller size the electron repulsion will be more in f so more amount of enrgy should be required by f to add an electron as compared to cl??
Answer» Why cl has more electron gain enthelpy than f? Electron gain enthelpy is inversily praportional to size, so f has smaller size than cl and electron gain enthelpy also decrease down the group.so f should have more electron gain enthelpy than cl electron gain enthelpy is amount of energy released or absorbed on addition of an electron,do due to smaller size the electron repulsion will be more in f so more amount of enrgy should be required by f to add an electron as compared to cl??

Discussion

5610.	Which of the following is not observed when aluminium is added to a solution of copper sulphate?
Answer» Which of the following is not observed when aluminium is added to a solution of copper sulphate?

Discussion

5611.	(a) Describe, giving the equation, a chemical reaction which is characteristic of saturated hydrocarbons (or alkanes). (b) What is an oxidising agent? Name two oxidising agents which can oxidise ethanol to ethanoic acid. (c) Describe one reaction of a carboxylic acid.
Answer» (a) Describe, giving the equation, a chemical reaction which is characteristic of saturated hydrocarbons (or alkanes). (b) What is an oxidising agent? Name two oxidising agents which can oxidise ethanol to ethanoic acid. (c) Describe one reaction of a carboxylic acid.

Discussion

5612.	We cannot store $CuSO_4$ solution in an iron vessel. Why?
Answer» We cannot store $CuSO_4$ solution in an iron vessel. Why?

Discussion

5613.	Explain the terms.a. Metallurgy b. Oresc. Minerals d. Gangue
Answer» Explain the terms. a. Metallurgy b. Ores c. Minerals d. Gangue

Discussion

5614.	Question 15Give two important uses of washing soda and baking soda.
Answer» Question 15 Give two important uses of washing soda and baking soda.

Discussion

5615.	Identify the balanced equation from the given options.
Answer» Identify the balanced equation from the given options.

Discussion

5616.	(a) Define the following in terms of gain or loss of hydrogen with one example each : (i) oxidation (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxid. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.
Answer» (a) Define the following in terms of gain or loss of hydrogen with one example each : (i) oxidation (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxid. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

5616.

(a) Define the following in terms of gain or loss of hydrogen with one example each : (i) oxidation (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxid. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

Answer»

(a) Define the following in terms of gain or loss of hydrogen with one example each :

(i) oxidation (ii) reduction

(b) When a magnesium ribbon is heated, it burns in air to form magnesium oxid. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

Discussion

5617.	What are alkenes, ethene and propene called?
Answer» What are alkenes, ethene and propene called?

Discussion

5618.	A solution of 150 ml contains 60% milk ,the rest being water water how much water should be added to the solution so that the percentage of milk in the resulting mixture is only 50%
Answer» A solution of 150 ml contains 60% milk ,the rest being water water how much water should be added to the solution so that the percentage of milk in the resulting mixture is only 50%

Discussion

5619.	how to find primary,secondary and tertiary carbon
Answer» how to find primary,secondary and tertiary carbon

Discussion

5620.	Question 59 A non-metal A, which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of catalyst Fe, gives a gas B. On heating with O2, it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D, which acts as a strong oxidising agent. (a) Identify A, B, C and D (b) To which group of periodic table does this non-metal belong?
Answer» Question 59 A non-metal A, which is the largest constituent of air, when heated with $H_{2}$ in 1:3 ratio in the presence of catalyst $Fe$ , gives a gas B. On heating with $O_{2}$ , it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D, which acts as a strong oxidising agent. (a) Identify A, B, C and D (b) To which group of periodic table does this non-metal belong?

Discussion

5621.	Draw Lewis dot structures of SO3 molecule and (SO3)2- ion and mention Co-ordinate bonds wherever required.
Answer» Draw Lewis dot structures of SO3 molecule and (SO3)2- ion and mention Co-ordinate bonds wherever required.

Discussion

5622.	The reducing capacity of alkali metals increases as we move down the group. Explain.
Answer» The reducing capacity of alkali metals increases as we move down the group. Explain.

Discussion

5623.	Question 19.2Write the balanced chemical equation for the following reaction and identify the type of reaction:Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.
Answer» Question 19.2 Write the balanced chemical equation for the following reaction and identify the type of reaction: Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

Discussion

5624.	What is isomorphous substance
Answer» What is isomorphous substance

Discussion

5625.	Copy and complete the following equations:(i) Mg3N2 + 6H2O → (ii) 2NH3 + 3CuO → (iii) 8NH3 + 3Cl2 → (iv) 4NH3 + 5O2 →
Answer» Copy and complete the following equations: (i) Mg₃N₂ + 6H₂O $\overset{}{\to}$ (ii) 2NH₃ + 3CuO $\overset{}{\to}$ (iii) 8NH₃ + 3Cl₂ $\overset{}{\to}$ (iv) 4NH₃ + 5O₂ $\overset{}{\to}$

Discussion

5626.	Why is solid ferric chloride stored in air tight bottles?
Answer» Why is solid ferric chloride stored in air tight bottles?

Discussion

5627.	One Atomic mass unit is _______ times the mass of one atom of _____________.
Answer» One Atomic mass unit is _______ times the mass of one atom of _____________.

Discussion

5628.	At 25 ∘C, the vapour pressure of pure liquid A (mol. wt. =40) is 100 torr, while that of pure liquid B is 40 torr (mol. wt. =80). The vapour pressure at 25 ∘C of a solution containing 20 g of each A and B is:
Answer» At $25^{\circ} C$ , the vapour pressure of pure liquid A (mol. wt. $= 40$ ) is $100 torr$ , while that of pure liquid B is $40 torr$ (mol. wt. $= 80$ ). The vapour pressure at $25^{\circ} C$ of a solution containing $20 g$ of each A and B is:

Discussion

5629.	Which of the following are not the structural isomers of C6H14 ?
Answer» Which of the following are not the structural isomers of $C_{6} H_{14}$ ?

Discussion

5630.	Give the number of the group and the period of the element having three shells with three electrons in valence shell.
Answer» Give the number of the group and the period of the element having three shells with three electrons in valence shell.

Discussion

5631.	Question 10:Explain the differences between acid and base.
Answer» Question 10: Explain the differences between acid and base.

5631.

Question 10:Explain the differences between acid and base.

Answer»

Question 10:

Explain the differences between acid and base.

Discussion

5632.	What does 2H2O represent?
Answer» What does $2 H_{2} O$ represent?

Discussion

5633.	What are balanced equations and why is it important to balance them
Answer» What are balanced equations and why is it important to balance them

Discussion

5634.	If one mole of carbon atoms weight 12g , what is the mass of 1atom of carbon??
Answer» If one mole of carbon atoms weight 12g , what is the mass of 1atom of carbon??

Discussion

5635.	What is an alloy? An alloy usually has some property which makes it useful in a specific way. What is the special property of:(a) duralumin?(b) type metal?
Answer» What is an alloy? An alloy usually has some property which makes it useful in a specific way. What is the special property of: (a) duralumin? (b) type metal?

Discussion

5636.	Metals always form basic oxides. Why is this statement incorrect?
Answer» Metals always form basic oxides. Why is this statement incorrect?

Discussion

5637.

2 mL of ethanoic acid was taken in each of test-tube I and test-tube II. A red litmus paper was introduced in test-tube I and a pH paper was introduced in test-tube II. The experiment was performed by four students A, B, C and D, they reported their observations as given below : Student Action on red litmus Action of pH paper A B C D Turned blue Remains unchanged Turned blue Remains unchanged Turned pink Turned green Turned blue Turned pink The correct set of observations was made by the student :(1) A(2) B(3) C(4) D

Answer» 2 mL of ethanoic acid was taken in each of test-tube I and test-tube II. A red litmus paper was introduced in test-tube I and a pH paper was introduced in test-tube II. The experiment was performed by four students A, B, C and D, they reported their observations as given below :

Student	Action on red litmus	Action of pH paper
A B C D	Turned blue Remains unchanged Turned blue Remains unchanged	Turned pink Turned green Turned blue Turned pink

The correct set of observations was made by the student :

(1) A

(2) B

(3) C

(4) D

Discussion

5638.	How to convert kilograms to moles
Answer» How to convert kilograms to moles

Discussion

5639.	45. decinormal solution of acetic acid ionised to an extent of 1.3%. ph of this solution will be (log 1.3 = 0.11)?
Answer» 45. decinormal solution of acetic acid ionised to an extent of 1.3%. ph of this solution will be (log 1.3 = 0.11)?

Discussion

5640.	Cu2S+(SO4)-2=Cu+2 + (SO3)-2. Balance this Redox reaction by Half reaction method
Answer» Cu2S+(SO4)-2=Cu+2 + (SO3)-2. Balance this Redox reaction by Half reaction method

Discussion

5641.	According to Arrhenius, acid generates _____ ions in water.
Answer» According to Arrhenius, acid generates _____ ions in water.

Discussion

5642.	Among the following elements, which element will be most electronegative?
Answer» Among the following elements, which element will be most electronegative?

Discussion

5643.	ntA six coordinate complex of formula CrCl3.6H2O has green colour. A 0.1 M solution of the complex when treated with excess of AgNO3gave 28.7 g of white precipitate. The formula of the complex would be:n
Answer» ntA six coordinate complex of formula CrCl3.6H2O has green colour. A 0.1 M solution of the complex when treated with excess of AgNO3gave 28.7 g of white precipitate. The formula of the complex would be:n

Discussion

5644.

Match the following: Reactants Products Types of Reactions Fe + S NaCl + H2O Oxidation CuSO4 + Zn 2CuO Neutralization 2Cu + O2 ZnSO4 + Cu Displacement HCl + NaOH FeS Combination

Answer»

Match the following:

Reactants	Products	Types of Reactions
Fe + S	NaCl + H₂O	Oxidation
CuSO₄ + Zn	2CuO	Neutralization
2Cu + O₂	ZnSO₄ + Cu	Displacement
HCl + NaOH	FeS	Combination

Discussion

5645.	How to know the chemical formula of a compound?
Answer» How to know the chemical formula of a compound?

Discussion

5646.	You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell whether the gas used in experiment was hydrogen chloride or ammonia?
Answer» You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell whether the gas used in experiment was hydrogen chloride or ammonia?

Discussion

5647.	The following is an extract from 'Metals in the service of man, Alexander and street / Pelican 1976' : Alumina (aluminium oxide) has a very high melting point of over 2000°C, so that it cannot readily be liquefied. However,conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance.(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.(d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium.(e) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.(f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.
Answer» The following is an extract from 'Metals in the service of man, Alexander and street / Pelican 1976' : Alumina (aluminium oxide) has a very high melting point of over 2000°C, so that it cannot readily be liquefied. However,conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance. (a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide? (b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction. (c) Name the element which serves both as the anode and the cathode in the extraction of aluminium. (d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium. (e) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis. (f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.

Discussion

5648.	Write balanced equations for the following reactions: copper oxide and dilute hydrochloric acid.Manganese (IV) oxide and concentrated hydrochloric acid.(a) Name the experiment illustrated above.(b) Which property of hydrogen chloride is demonstrated by this experiment?(c) State the colour of the water that has entered the round-bottomed flask.
Answer» Write balanced equations for the following reactions: copper oxide and dilute hydrochloric acid. Manganese (IV) oxide and concentrated hydrochloric acid. (a) Name the experiment illustrated above. (b) Which property of hydrogen chloride is demonstrated by this experiment? (c) State the colour of the water that has entered the round-bottomed flask.

Discussion

5649.	47. In 6l vessel a gas X is present. If critical temp. Of gas is 304.1Kand vanderwall const.a=2 then volume occupied by molecule for 1mol of gas is
Answer» 47. In 6l vessel a gas X is present. If critical temp. Of gas is 304.1Kand vanderwall const.a=2 then volume occupied by molecule for 1mol of gas is

Discussion

5650.	29. Which method can be used to distinguish [Co(NH3)6] [Cr(NO2)6] and [Cr(NH3)6] [Co(NO2)6] a. by measurement of their conductivity b. by titration method c. by percipitation method with AgNO3 d. by electrolysis of their aqueos solution
Answer» 29. Which method can be used to distinguish [Co(NH3)6] [Cr(NO2)6] and [Cr(NH3)6] [Co(NO2)6] a. by measurement of their conductivity b. by titration method c. by percipitation method with AgNO3 d. by electrolysis of their aqueos solution

Discussion

5612.	We cannot store \(CuSO_4\) solution in an iron vessel. Why?
Answer» We cannot store \(CuSO_4\) solution in an iron vessel. Why?

Explore topic-wise InterviewSolutions in .

For Frost, what do ‘fire’ and ‘ice’ stand for? Here are some ideas:GreedAvariceCrueltyLustConflictFuryIntolerance RigidityInsensitivity Coldness Indifference Hatred

Describe the Ostwald's process for the manufacture of nitric acid with labelled diagram.

42. Prove that the density of oxygen gas at NTP is 1.429 g/l.

Na+ has completely filled K and L shells. Explain.

in the electrolysis of alkaline water a total of 1 mol of gases is evolved. the amount of water decomposed would

What is the product of 3x,2xy and 15

Which of the following is not observed when aluminium is added to a solution of copper sulphate?

(a) Describe, giving the equation, a chemical reaction which is characteristic of saturated hydrocarbons (or alkanes). (b) What is an oxidising agent? Name two oxidising agents which can oxidise ethanol to ethanoic acid. (c) Describe one reaction of a carboxylic acid.

We cannot store \(CuSO_4\) solution in an iron vessel. Why?

Explain the terms.a. Metallurgy b. Oresc. Minerals d. Gangue

Question 15Give two important uses of washing soda and baking soda.

Identify the balanced equation from the given options.

What are alkenes, ethene and propene called?

A solution of 150 ml contains 60% milk ,the rest being water ​water how much water should be added to the solution so that the percentage of milk in the resulting mixture is only 50%

how to find primary,secondary and tertiary carbon

Draw Lewis dot structures of SO3 molecule and (SO3)2- ion and mention Co-ordinate bonds wherever required.

The reducing capacity of alkali metals increases as we move down the group. Explain.

Question 19.2Write the balanced chemical equation for the following reaction and identify the type of reaction:Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

What is isomorphous substance

Copy and complete the following equations:(i) Mg3N2 + 6H2O → (ii) 2NH3 + 3CuO → (iii) 8NH3 + 3Cl2 → (iv) 4NH3 + 5O2 →

Why is solid ferric chloride stored in air tight bottles?

One Atomic mass unit is _______ times the mass of one atom of _____________.

At 25 ∘C, the vapour pressure of pure liquid A (mol. wt. =40) is 100 torr, while that of pure liquid B is 40 torr (mol. wt. =80). The vapour pressure at 25 ∘C of a solution containing 20 g of each A and B is:

Which of the following are not the structural isomers of C6H14 ?

Give the number of the group and the period of the element having three shells with three electrons in valence shell.

Question 10:Explain the differences between acid and base.

What does 2H2O represent?

What are balanced equations and why is it important to balance them

If one mole of carbon atoms weight 12g , what is the mass of 1atom of carbon??

What is an alloy? An alloy usually has some property which makes it useful in a specific way. What is the special property of:(a) duralumin?(b) type metal?

Metals always form basic oxides. Why is this statement incorrect?

How to convert kilograms to moles

45. decinormal solution of acetic acid ionised to an extent of 1.3%. ph of this solution will be (log 1.3 = 0.11)?

Cu2S+(SO4)-2=Cu+2 + (SO3)-2. Balance this Redox reaction by Half reaction method

According to Arrhenius, acid generates _____ ions in water.

Among the following elements, which element will be most electronegative?

ntA six coordinate complex of formula CrCl3.6H2O has green colour. A 0.1 M solution of the complex when treated with excess of AgNO3gave 28.7 g of white precipitate. The formula of the complex would be:n

Match the following: Reactants Products Types of Reactions Fe + S NaCl + H2O Oxidation CuSO4 + Zn 2CuO Neutralization 2Cu + O2 ZnSO4 + Cu Displacement HCl + NaOH FeS Combination

How to know the chemical formula of a compound?

You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell whether the gas used in experiment was hydrogen chloride or ammonia?

47. In 6l vessel a gas X is present. If critical temp. Of gas is 304.1Kand vanderwall const.a=2 then volume occupied by molecule for 1mol of gas is

29. Which method can be used to distinguish [Co(NH3)6] [Cr(NO2)6] and [Cr(NH3)6] [Co(NO2)6] a. by measurement of their conductivity b. by titration method c. by percipitation method with AgNO3 d. by electrolysis of their aqueos solution

A solution of 150 ml contains 60% milk ,the rest being water water how much water should be added to the solution so that the percentage of milk in the resulting mixture is only 50%

One Atomic mass unit is _ times the mass of one atom of _______.