15280 + Interview Questions in Chemistry Page 159 InterviewSolution

7901.	A cylinder can withstand a pressure of 15 atm. The pressure gauge of the cylinder indicates 12 atm at 27∘C. Above the cylinder will explode.
Answer» A cylinder can withstand a pressure of 15 atm. The pressure gauge of the cylinder indicates 12 atm at 27∘C. Above the cylinder will explode.

Discussion

7902.	Name the non-metal which is used: (a) to convert vegetable oil into vegetable ghee(solid fat) (b) as a rocket fuel (in liquid form). (c) to make electrodes of dry cells. (d) to preserve food materials. (e) in the vulcanization of rubber.
Answer» Name the non-metal which is used: (a) to convert vegetable oil into vegetable ghee(solid fat) (b) as a rocket fuel (in liquid form). (c) to make electrodes of dry cells. (d) to preserve food materials. (e) in the vulcanization of rubber.

Discussion

7903.	Sulphuric acid is a highly corrosive strong mineral acid which is a molecular combination of:
Answer» Sulphuric acid is a highly corrosive strong mineral acid which is a molecular combination of:

Discussion

7904.	What do you see when concentrated sulphuric acid is added to copper sulphate-5-water. (You are not required to say what is happening, nor is it necessary to name the products.)
Answer» What do you see when concentrated sulphuric acid is added to copper sulphate-5-water. (You are not required to say what is happening, nor is it necessary to name the products.)

Discussion

7905.	What will be the formula and structure of benzene? [2 MARKS]
Answer» What will be the formula and structure of benzene? [2 MARKS]

Discussion

7906.	What changes would you suggest at home to make it more environment friendly? [3 MARKS]
Answer» What changes would you suggest at home to make it more environment friendly? [3 MARKS]

Discussion

7907.	How many moles are there in 19 atoms of Fluorine?
Answer» How many moles are there in 19 atoms of Fluorine?

Discussion

7908.	In a mixture of waek acid and its salt, the ratio of the concentration of acid to salt is increased ten fold, the pH of the solution changes by
Answer» In a mixture of waek acid and its salt, the ratio of the concentration of acid to salt is increased ten fold, the pH of the solution changes by

Discussion

7909.	4g of Mg is reacted with 8g of O. Mole of MgO produced in the reaction is
Answer» 4g of Mg is reacted with 8g of O. Mole of MgO produced in the reaction is

Discussion

7910.	Write scientific reasons.a. Lemon or tamarind is used for cleaning copper vessels turned greenish.b. Generally the ionic compounds have high melting points.c. Sodium is always kept in kerosene.d. Pine oil is used in froth flotation.e. Anodes need to be replaced from time to time during the electrolysis of alumina.
Answer» Write scientific reasons. a. Lemon or tamarind is used for cleaning copper vessels turned greenish. b. Generally the ionic compounds have high melting points. c. Sodium is always kept in kerosene. d. Pine oil is used in froth flotation. e. Anodes need to be replaced from time to time during the electrolysis of alumina.

Discussion

7911.	when quick lime is put in water it starts boiling violently. why do you think this happens?
Answer» when quick lime is put in water it starts boiling violently. why do you think this happens?

Discussion

7912.	The radius R of a nucleus of mass number A can be estimated by the formula R=(1.3×10−15)A13 m. It follows that the mass density of a nucleus is of the order of: Mprot.≅Mneut.≃1.67×10−27 kg
Answer» The radius $R$ of a nucleus of mass number $A$ can be estimated by the formula $R = (1.3 \times 10^{- 15}) A^{\frac{1}{3}} m .$ It follows that the mass density of a nucleus is of the order of: $M_{prot.} ≅ M_{neut.} ≃ 1.67 \times 10^{- 27} kg$

Discussion

7913.	When we decompose Water we get O and OH But when we Combine O2 and H we get water why is this happening?
Answer» When we decompose Water we get O and OH But when we Combine O2 and H we get water why is this happening?

7913.

When we decompose Water we get O and OH But when we Combine O2 and H we get water why is this happening?

Answer»

When we decompose Water we get O and OH

But when we Combine O2 and H we get water why is this happening?

Discussion

7914.	Which one of the following is not a fossil fuel ? (a) petrol (b) coke (c) charcoal (d) coal
Answer» Which one of the following is not a fossil fuel ? (a) petrol (b) coke (c) charcoal (d) coal

Discussion

7915.	Concentrated aqueous sulpheric acid is 98%of H2SO4 by mass and has density of 1. 80gmL-1volume of acid required to make one litre of 0. 01 m H2S04 solution is
Answer» Concentrated aqueous sulpheric acid is 98%of H2SO4 by mass and has density of 1. 80gmL-1volume of acid required to make one litre of 0. 01 m H2S04 solution is

Discussion

7916.	Which of the following solutions should be put on a universal indicator paper so that its colour may change to green?(1) Milk(2) Common salt solution(3) Baking soda solution(4) Milk of magnesia
Answer» Which of the following solutions should be put on a universal indicator paper so that its colour may change to green? (1) Milk (2) Common salt solution (3) Baking soda solution (4) Milk of magnesia

Discussion

7917.	What happens when aluminium reacts with boiling dil. KOH?
Answer» What happens when aluminium reacts with boiling dil. KOH?

Discussion

7918.	(a) Give three uses of ammonium chloride.(b) Why is ammonium hydroxide used in qualitative analysis? Give two equations to justify your answer.
Answer» (a) Give three uses of ammonium chloride. (b) Why is ammonium hydroxide used in qualitative analysis? Give two equations to justify your answer.

Discussion

7919.	Name a non-metal which conducts electricity.
Answer» Name a non-metal which conducts electricity.

Discussion

7920.	Which metals do not corrode easily?
Answer» Which metals do not corrode easily?

Discussion

7921.	10. Does PH5 molecule exist??
Answer» 10. Does PH5 molecule exist??

Discussion

7922.	Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.
Answer» Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

Discussion

7923.	Two vessels contain two different ideal gases A and B at same temperature. If the ratio of molecular weights of A and B is 3:4 then ratio of densities of A and B, if the ratio of pressure is 8:9 is
Answer» Two vessels contain two different ideal gases A and B at same temperature. If the ratio of molecular weights of A and B is 3:4 then ratio of densities of A and B, if the ratio of pressure is 8:9 is

Discussion

7924.	The following questions are about electroplating a copper wire with silver.(a) What ions must be present in the electrolyte?(b) Of what substance must the anode be made up of?(c) What will the cathode be made up of?(d) Write the equation for the reaction which takes place at the cathode.
Answer» The following questions are about electroplating a copper wire with silver. (a) What ions must be present in the electrolyte? (b) Of what substance must the anode be made up of? (c) What will the cathode be made up of? (d) Write the equation for the reaction which takes place at the cathode.

Discussion

7925.	Among the following molecules, (i)XeO3 (ii)XeOF4 (iii)XeF6 Those having same number of lone pairs on Xe are:
Answer» Among the following molecules, $(i) X e O_{3}$ $(i i) X e O F_{4}$ $(i i i) X e F_{6}$ Those having same number of lone pairs on Xe are:

7925.

Among the following molecules, (i)XeO3 (ii)XeOF4 (iii)XeF6 Those having same number of lone pairs on Xe are:

Answer»

Among the following molecules,

$(i) X e O_{3}$

$(i i) X e O F_{4}$

$(i i i) X e F_{6}$

Those having same number of lone pairs on Xe are:

Discussion

7926.	5. Why Na2HPO4 is an acid salt but NA2HPO3 is a normal salt?
Answer» 5. Why Na2HPO4 is an acid salt but NA2HPO3 is a normal salt?

Discussion

7927.	How will you indicate the following effects in a chemical equation ? (a) A solution made in water (b) Exothermic reaction (c) Endothermic reaction
Answer» How will you indicate the following effects in a chemical equation ? (a) A solution made in water (b) Exothermic reaction (c) Endothermic reaction

7927.

How will you indicate the following effects in a chemical equation ? (a) A solution made in water (b) Exothermic reaction (c) Endothermic reaction

Answer»

How will you indicate the following effects in a chemical equation ?

(a) A solution made in water

(b) Exothermic reaction

(c) Endothermic reaction

Discussion

7928.	A solution is obtained by mixing 0.2M,500ml NH_4OH and 0.1M,200ml HCl. Then find pH of a)solution formed b)when 0.4g NaOH is added to it c)when 0.365g HCl is added to it K_b of NH_4OH is 10^{-5
Answer» A solution is obtained by mixing 0.2M,500ml NH_4OH and 0.1M,200ml HCl. Then find pH of a)solution formed b)when 0.4g NaOH is added to it c)when 0.365g HCl is added to it K_b of NH_4OH is 10^{-5

Discussion

7929.	\overset{}{cyclehexanol\xrightarrow{CrO3}\xrightarrow{CH3NH2}}\xrightarrow{H2/Pd}\lbrack X\rbrack Product \lbrack X\rbrack of given reaction is :
Answer» \overset{}{cyclehexanol\xrightarrow{CrO3}\xrightarrow{CH3NH2}}\xrightarrow{H2/Pd}\lbrack X\rbrack Product \lbrack X\rbrack of given reaction is :

Discussion

7930.	What happens when trimethylaluminium chloride reacts with metals like tin,copper etc
Answer» What happens when trimethylaluminium chloride reacts with metals like tin,copper etc

Discussion

7931.	Write the chemical formulae of the following:(a) Magnesium chloride(b) Calcium oxide(c) Copper nitrate(d) Aluminium chloride(e) Calcium carbonate
Answer» Write the chemical formulae of the following: (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate

Discussion

7932.	25. Which of the following statements is wrong for gases?(1) Confined gas exerts uniform pressure on thewalls of its container in all directions(2) Volume of the gas is equal to volume of containerconfining the gasGases do not have a definite shape and volume(3)1(4) Mass of a gas cannot be determined by weighinga container in which it is enclosed
Answer» 25. Which of the following statements is wrong for gases?(1) Confined gas exerts uniform pressure on thewalls of its container in all directions(2) Volume of the gas is equal to volume of containerconfining the gasGases do not have a definite shape and volume(3)1(4) Mass of a gas cannot be determined by weighinga container in which it is enclosed

Discussion

7933.	How to find oxidation state of nitrogen?
Answer» How to find oxidation state of nitrogen?

Discussion

7934.	define the electrolysis of copper sulphate
Answer» define the electrolysis of copper sulphate

Discussion

7935.	Write the names of the following functional groups:
Answer» Write the names of the following functional groups:

7935.

Write the names of the following functional groups:

Answer»

Write the names of the following functional groups:

Discussion

7936.	A salt is dissolved in water and the pH of this solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:
Answer» A salt is dissolved in water and the $p H$ of this solution is measured with a universal indicator paper. If the $p H$ of solution is less than $7$ , the salt is most likely to be:

Discussion

7937.	Why is hydrogen peroxide kept in coloured bottles? Also give the reaction if it is kept in light.
Answer» Why is hydrogen peroxide kept in coloured bottles? Also give the reaction if it is kept in light.

Discussion

7938.	If the enthalpies of formation of C3 h8 CO2 and H2O standard condition and - 104 kilo joule per mole - 394 kilo joule per mole and -2 86 kilo joule per mole respectively then the standard enthalpy of combustion of 66 gram of C3 h8 is
Answer» If the enthalpies of formation of C3 h8 CO2 and H2O standard condition and - 104 kilo joule per mole - 394 kilo joule per mole and -2 86 kilo joule per mole respectively then the standard enthalpy of combustion of 66 gram of C3 h8 is

Discussion

7939.	The electronic configuration of palladium is
Answer» The electronic configuration of palladium is

Discussion

7940.	ntIs tin a part of the reactivity series also known as activity series ?n
Answer» ntIs tin a part of the reactivity series also known as activity series ?n

Discussion

7941.	State modern periodic laws.
Answer» State modern periodic laws.

Discussion

7942.	does all artificial sweetening agents will not provide calorie
Answer» does all artificial sweetening agents will not provide calorie

Discussion

7943.	Above reaction is a Baeyer Villiger rearrangement of an asymmetric ketone with magnesium monoperoxypthalate hexahydrate (in the drawing , Mg+2 is omitted for clearity). Identify the major product.
Answer» Above reaction is a Baeyer Villiger rearrangement of an asymmetric ketone with magnesium monoperoxypthalate hexahydrate (in the drawing , $M g^{+ 2}$ is omitted for clearity). Identify the major product.

Discussion

7944.	H2SO4 in aqueus medium ionises in two stepsHow ka1 >> ka2Howmany H+ions released in both stepsExplain
Answer» H2SO4 in aqueus medium ionises in two steps How ka1 >> ka2 Howmany H+ions released in both steps Explain

Discussion

7945.	CsCl has ______ Coordination.
Answer» CsCl has ______ Coordination.

Discussion

7946.	How many moles of H2SO4 contains 4 grams of sulphur in it?
Answer» How many moles of H2SO4 contains 4 grams of sulphur in it?

Discussion

7947.	What is Oil drop experiment
Answer» What is Oil drop experiment

Discussion

7948.	Choose the correct option regarding pH of a salt:
Answer» Choose the correct option regarding pH of a salt:

Discussion

7949.	The total of C−C sigma bonds/s is mesityl oxide (C6H10O) is (Round off to the Nearest Integer).
Answer» The total of $C - C$ sigma bonds/s is mesityl oxide $(C_{6} H_{10} O)$ is (Round off to the Nearest Integer).

Discussion

7950.	What do you understand by an alkali? Give two examples of : (a) strong alkalis, (b) weak alkalis.
Answer» What do you understand by an alkali? Give two examples of : (a) strong alkalis, (b) weak alkalis.

7950.

What do you understand by an alkali? Give two examples of : (a) strong alkalis, (b) weak alkalis.

Answer»

What do you understand by an alkali?

Give two examples of :

(a) strong alkalis, (b) weak alkalis.

Discussion

Explore topic-wise InterviewSolutions in .

A cylinder can withstand a pressure of 15 atm. The pressure gauge of the cylinder indicates 12 atm at 27∘C. Above the cylinder will explode.

Name the non-metal which is used: (a) to convert vegetable oil into vegetable ghee(solid fat) (b) as a rocket fuel (in liquid form). (c) to make electrodes of dry cells. (d) to preserve food materials. (e) in the vulcanization of rubber.

Sulphuric acid is a highly corrosive strong mineral acid which is a molecular combination of:

What do you see when concentrated sulphuric acid is added to copper sulphate-5-water. (You are not required to say what is happening, nor is it necessary to name the products.)

What will be the formula and structure of benzene? [2 MARKS]

What changes would you suggest at home to make it more environment friendly? [3 MARKS]

How many moles are there in 19 atoms of Fluorine?

In a mixture of waek acid and its salt, the ratio of the concentration of acid to salt is increased ten fold, the pH of the solution changes by

4g of Mg is reacted with 8g of O. Mole of MgO produced in the reaction is

when quick lime is put in water it starts boiling violently. why do you think this happens?

The radius R of a nucleus of mass number A can be estimated by the formula R=(1.3×10−15)A13 m. It follows that the mass density of a nucleus is of the order of: Mprot.≅Mneut.≃1.67×10−27 kg

When we decompose Water we get O and OH But when we Combine O2 and H we get water why is this happening?

Which one of the following is not a fossil fuel ? (a) petrol (b) coke (c) charcoal (d) coal

Concentrated aqueous sulpheric acid is 98%of H2SO4 by mass and has density of 1. 80gmL-1volume of acid required to make one litre of 0. 01 m H2S04 solution is

Which of the following solutions should be put on a universal indicator paper so that its colour may change to green?(1) Milk(2) Common salt solution(3) Baking soda solution(4) Milk of magnesia

What happens when aluminium reacts with boiling dil. KOH?

(a) Give three uses of ammonium chloride.(b) Why is ammonium hydroxide used in qualitative analysis? Give two equations to justify your answer.

Name a non-metal which conducts electricity.

Which metals do not corrode easily?

10. Does PH5 molecule exist??

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

Two vessels contain two different ideal gases A and B at same temperature. If the ratio of molecular weights of A and B is 3:4 then ratio of densities of A and B, if the ratio of pressure is 8:9 is

The following questions are about electroplating a copper wire with silver.(a) What ions must be present in the electrolyte?(b) Of what substance must the anode be made up of?(c) What will the cathode be made up of?(d) Write the equation for the reaction which takes place at the cathode.

Among the following molecules, (i)XeO3 (ii)XeOF4 (iii)XeF6 Those having same number of lone pairs on Xe are:

5. Why Na2HPO4 is an acid salt but NA2HPO3 is a normal salt?

How will you indicate the following effects in a chemical equation ? (a) A solution made in water (b) Exothermic reaction (c) Endothermic reaction

A solution is obtained by mixing 0.2M,500ml NH_4OH and 0.1M,200ml HCl. Then find pH of a)solution formed b)when 0.4g NaOH is added to it c)when 0.365g HCl is added to it K_b of NH_4OH is 10^{-5

\overset{}{cyclehexanol\xrightarrow{CrO3}\xrightarrow{CH3NH2}}\xrightarrow{H2/Pd}\lbrack X\rbrack Product \lbrack X\rbrack of given reaction is :

What happens when trimethylaluminium chloride reacts with metals like tin,copper etc

Write the chemical formulae of the following:(a) Magnesium chloride(b) Calcium oxide(c) Copper nitrate(d) Aluminium chloride(e) Calcium carbonate

How to find oxidation state of nitrogen?

define the electrolysis of copper sulphate

Write the names of the following functional groups:

A salt is dissolved in water and the pH of this solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:

Why is hydrogen peroxide kept in coloured bottles? Also give the reaction if it is kept in light.

If the enthalpies of formation of C3 h8 CO2 and H2O standard condition and - 104 kilo joule per mole - 394 kilo joule per mole and -2 86 kilo joule per mole respectively then the standard enthalpy of combustion of 66 gram of C3 h8 is

The electronic configuration of palladium is

ntIs tin a part of the reactivity series also known as activity series ?n

State modern periodic laws.

does all artificial sweetening agents will not provide calorie

Above reaction is a Baeyer Villiger rearrangement of an asymmetric ketone with magnesium monoperoxypthalate hexahydrate (in the drawing , Mg+2 is omitted for clearity). Identify the major product.

H2SO4 in aqueus medium ionises in two stepsHow ka1 >> ka2Howmany H+ions released in both stepsExplain

CsCl has ______ Coordination.

How many moles of H2SO4 contains 4 grams of sulphur in it?

What is Oil drop experiment

Choose the correct option regarding pH of a salt:

The total of C−C sigma bonds/s is mesityl oxide (C6H10O) is (Round off to the Nearest Integer). ​​​​​​​

What do you understand by an alkali? Give two examples of : (a) strong alkalis, (b) weak alkalis.

The total of C−C sigma bonds/s is mesityl oxide (C6H10O) is (Round off to the Nearest Integer).