16 + Interview Questions in SULPHURIC ACID IN GENERAL AWARENESS Page 1 InterviewSolution

1.	A, B, C and D summarize the properties of Sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (iii): A. Dilute acid (typical acid properties) B. Non-volatile acid. C. Oxidizing agent. D. Dehydrating agent (i) Preparation of Hydrogen Chloride. (ii) Preparation of Ethene from Ethanol. (iii) Preparation of Copper sulphate from Copper oxide.
Answer» (i) B (non-volatile acid). (ii) D (dehydrating agent) (iii) A (dilute acid).

1.

A, B, C and D summarize the properties of Sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (iii): A. Dilute acid (typical acid properties) B. Non-volatile acid. C. Oxidizing agent. D. Dehydrating agent (i) Preparation of Hydrogen Chloride. (ii) Preparation of Ethene from Ethanol. (iii) Preparation of Copper sulphate from Copper oxide.

Answer»

(i) B (non-volatile acid).

(ii) D (dehydrating agent)

(iii) A (dilute acid).

2.	Why the level of concentrated sulphuric acid gets higher if it is left in an open vessel for a week ?
Answer» This is due to the hygroscopic nature of sulphuric acid. It absorbs water vapour from the atmosphere.

Discussion

3.	The impurity of arsenic oxide must be removed before passing the mixture of sulphur dioxide and air through the catalytic chamber in contact process. Why ?
Answer» Because the impunty of arsenic oxide makes the catalyst poisonous.

Discussion

4.	What is the catalyst used in catalytic chamber and what is the temperature used ?
Answer» The catalyst used is platinized asbestos or vanadium pentaoxide and the temperature used is about 450°C.

Discussion

5.	State the property of sulphur dioxide which causes potassium permanganate to change its colour from purple to colourless.
Answer» The property of sulphur dioxide Reducing.

Discussion

6.	Name the acid formed when sulphur dioxide dissolves in water.
Answer» Sulphurous acid.

Discussion

7.	What are the two necessary conditions for the direct combination of sulphur dioxide and chlorine forming sulphuryl chloride?
Answer» Sunlight and absence of moisture.

Discussion

8.	Why brisk effervesence is seen when H2SO4 is added to sodium carbonate?
Answer» This brisk effervescence is seen due to the evolution iof carbon dioxide gas.

Discussion

9.	(a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid?(b) What property of concentrated sulphuric acid is in action when sugar turns black in its presence?
Answer» (a) Concentrated sulphuric acid is non-volatile; hence it is used for the preparation of higher volatile acids. (b) Due to its dehydrating nature sugar turns black in the presence of concentrated sulphuric acid.

9.

(a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid?(b) What property of concentrated sulphuric acid is in action when sugar turns black in its presence?

Answer»

(a) Concentrated sulphuric acid is non-volatile; hence it is used for the preparation of higher volatile acids.

(b) Due to its dehydrating nature sugar turns black in the presence of concentrated sulphuric acid.

Discussion

10.	Why the wooden shelves on which cone, sulphuric acid bottles are kept, stained black ?
Answer» Concentrated sulphuric acid is a very powerful dehydrating agent. It removes atoms of hydrogen and oxygen in the form of water from the cellulose [(C₆H₁₂O₅ )n ], leaving behind carbon. It is black carbon which appears in the form of black stains.

Discussion

11.	Which property of sulphuric acid is used in the following:(i) As a source of hydrogen when treated in dilute form with metals like Zn, Mg, Fe, etc. (ii) Production of hydrogen chloride on treating concentrated add with sodium chloride. (iii) Production of sulphur dioxide on heating in concentrated form with copper turnings. (iv) Liberation of sulphur from H2S with concentrated form.(v) Charring of sugar with hot concentrated add. (vi) Liberation of ethylene gas with hot concentrated add. (vii) Liberation of carbon monoxide with hot concentrated add.
Answer» (i) Addic property. (ii) Non volatile nature. (iii) Oxidising nature. (iv) Oxidising property. (v) Dehydrating nature. (vi) Dehydrating nature. (vii) Dehydrating nature.

11.

Which property of sulphuric acid is used in the following:(i) As a source of hydrogen when treated in dilute form with metals like Zn, Mg, Fe, etc. (ii) Production of hydrogen chloride on treating concentrated add with sodium chloride. (iii) Production of sulphur dioxide on heating in concentrated form with copper turnings. (iv) Liberation of sulphur from H2S with concentrated form.(v) Charring of sugar with hot concentrated add. (vi) Liberation of ethylene gas with hot concentrated add. (vii) Liberation of carbon monoxide with hot concentrated add.

Answer»

(i) Addic property.

(ii) Non volatile nature.

(iii) Oxidising nature.

(iv) Oxidising property.

(v) Dehydrating nature.

(vi) Dehydrating nature.

(vii) Dehydrating nature.

Discussion

12.	Which two gases are combined during contact process ?
Answer» SO₂ and O₂ (sulphur dioxide and oxygen).

Discussion

13.	Write the equation for the reaction between zinc and the final product of the contact process ?
Answer» Zn + 2H₂SO₄ (Conc.) ⟶ ZnSO₄ + 2H₂O + SO₂.

Discussion

14.	What happens when sulphur trioxide gas is passed into concentrated sulphuric acid.
Answer» Sulphur trioxide gas dissolves in concentrated sulphuric acid to form fuming sulphuric acid, commonly known as oleum. SO₃ + H₂SO₄ ⟶ H₂S₂O₇ (Oleum)

14.

What happens when sulphur trioxide gas is passed into concentrated sulphuric acid.

Answer»

Sulphur trioxide gas dissolves in concentrated sulphuric acid to form fuming sulphuric acid, commonly known as oleum.

SO₃ + H₂SO₄ ⟶ H₂S₂O₇ (Oleum)

Discussion

15.	What happens when cone, sulphuric acid reacts with: (i) Potassium chloride (ii) Zinc nitrate.
Answer» (i) Cone, sulphuric acid reacts with potassium chloride and forms hydrogen chloride and potassium hydrogen sulphate. KCl + H₂SO₄ ⟶ KHSO₄ + HCl (ii) Cone, sulphuric acid reacts with zinc nitrate to form zinc sulphate and nitric add. Zn(NO₃)₂ + H₂SO₄ ⟶ ZnSO₄ + 2HNO₃

15.

What happens when cone, sulphuric acid reacts with: (i) Potassium chloride (ii) Zinc nitrate.

Answer»

(i) Cone, sulphuric acid reacts with potassium chloride and forms hydrogen chloride and potassium hydrogen sulphate.

KCl + H₂SO₄ ⟶ KHSO₄ + HCl

(ii) Cone, sulphuric acid reacts with zinc nitrate to form zinc sulphate and nitric add.

Zn(NO₃)₂ + H₂SO₄ ⟶ ZnSO₄ + 2HNO₃

Discussion

16.	Answer the following questions related to dilute and concentrated sulphuric acid. Which acid will give white precipitates with barium sulphate.
Answer» Dilutesiilphuric acid.

Discussion

Explore topic-wise InterviewSolutions in .

Why the level of concentrated sulphuric acid gets higher if it is left in an open vessel for a week ?

The impurity of arsenic oxide must be removed before passing the mixture of sulphur dioxide and air through the catalytic chamber in contact process. Why ?

What is the catalyst used in catalytic chamber and what is the temperature used ?

State the property of sulphur dioxide which causes potassium permanganate to change its colour from purple to colourless.

Name the acid formed when sulphur dioxide dissolves in water.

What are the two necessary conditions for the direct combination of sulphur dioxide and chlorine forming sulphuryl chloride?

Why brisk effervesence is seen when H2SO4 is added to sodium carbonate?

(a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid?(b) What property of concentrated sulphuric acid is in action when sugar turns black in its presence?

Why the wooden shelves on which cone, sulphuric acid bottles are kept, stained black ?

Which two gases are combined during contact process ?

Write the equation for the reaction between zinc and the final product of the contact process ?

What happens when sulphur trioxide gas is passed into concentrated sulphuric acid.

What happens when cone, sulphuric acid reacts with: (i) Potassium chloride (ii) Zinc nitrate.

Answer the following questions related to dilute and concentrated sulphuric acid. Which acid will give white precipitates with barium sulphate.