ICSE Class 10 Study of Compounds D. Sulphuric Acid Solution By Clarify knowledge

ICSE Class 10 Study of Compounds D. Sulphuric Acid Solution New Pattern

ICSE Class 10 Study of Compounds D. Sulphuric Acid Solution Table

OUR EBOOKS CAN HELP YOU ICSE CLASS 10 BOARD

CODE IS EASY CAN HELP YOU IN SEMESTER 2

Best Reference Books For Class 10 ICSE

Best Reference Books For Class 10 ICSE Physics Is OSWAL GURUKUL

ICSE Class 10 All Subject MCQ

• CHEMISTRY
• BIOLOGY
• MATHS
• PHYSICS
• HISTORY & CIVIC

Chapter 11 - Study of Compounds D. Sulphuric Acid Exercise Intext 1

Question 1

Comment, sulphuric acid is referred to as

(a) King of chemicals

(b) Oil of vitriolSolution 1

(a) Sulphuric acid is called King of Chemicals because there is no other manufactured compound which is used by such a large number of key industries.

(b) Sulphuric acid is referred to as Oil of vitriol as it was obtained as an oily viscous liquid by heating crystals of green vitriol.Question 2

Sulphuric acid is manufactured by contact process

(a) Give two balanced equations to obtain SO₂ in this process.

(b) Give the conditions for the oxidation of SO₂

(c) Name the catalyst used.

(d) Why H₂SO₄ is not obtained by directly reacting SO₃ with water.

(e) Name the chemical used to dissolve SO₃ and also name the product formed.

(f) Name a gas that can be oxidized to sulphur.
Solution 2

(a) Two balanced equations to obtain SO₂ is:

(i) 4FeS₂ + 11O₂ 2Fe₂O₃ +8SO₂

(ii) S +O₂ SO₂

(b) The conditions for the oxidation of SO₂ are:

(i) The temperature should be as low as possible. The yield has been found to be maximum at about 410⁰C-450^oC

(ii) High pressure (2 atm) is favoured because the product formed has less volume than reactant.

(iii) Excess of oxygen increases the production of sulphur trioxide.

(iv) Vanadium pentoxide or platinised asbestos is used as catalyst.

(c) Vanadium pentoxide (V₂O₅)

(d) Sulphuric acid is not obtained directly by reacting SO₃ with water because the reaction is highly exothermic which produce the fine misty droplets of sulphuric acid that is not directly absorbed by water.

(e)The chemical used to dissolve SO₃ is concentrated sulphuric acid. The product formed is oleum.

(f) Hydrogen sulphide.Question 3

Why the impurity of arsenic oxide must be removed before passing the mixture of SO₂ and air through the catalytic chamber?Solution 3

Impurity of ARSENIC poisons the catalyst [i.e. deactivates the catalyst]. So, it must be removed before passing the mixture of SO₂ air through the catalytic chamber.Question 4

(a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.

(b) In the contact process for the manufacture of sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two -steps procedure is used. Write the equations for the two steps involved in D.

(c) What type of substance will liberate sulphur dioxide from sodium sulphite in step E?

(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.Solution 4

(a) The catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C is Vanadium pentoxide.

(b) The two steps for the conversion of sulphur trioxide to sulphuric acid is:

(i) SO₃ + H₂SO₄H₂S₂O₇

(ii) H₂S₂O₇ + H₂O 2H₂SO₄

(c)The substance that will liberate sulphur dioxide in step E is dilute H₂SO_4.

(d) The equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F is:

SO₂+2NaOHNa₂SO₃+H₂O

         Or

Na₂O+SO₂Na₂SO₃

Chapter 11 - Study of Compounds D. Sulphuric Acid Exercise Ex. 11

Question 1

Why is water not added to concentrated H₂SO₄ in order to dilute it?Solution 1

Water is not added to concentrated acid since it is an exothermic reaction. If water is added to the acid, there is a sudden increase in temperature and the acid being in bulk tends to spurt out with serious consequences.Question 2

Give two balanced reactions of each type to show the following properties of sulphuric acid.

(a) Acidic nature

(b) Oxidising agent

(d) Non-volatile natureSolution 2

Balanced reactions are:

(a) Acidic nature:

(i) Dilute H₂SO₄ reacts with basic oxides to form sulphate and water.

2 NaOH+H₂SO₄ Na₂SO₄+2H₂O

(ii) CuO+H₂SO₄ CuSO₄+H₂O

(iii) It reacts with carbonate to produce CO₂.

Na₂CO₃+H₂SO₄Na₂SO₄+H₂O+CO₂ 

(b) Oxidising agent:

H₂SO₄ H₂O +SO₂ +[O]

Nascent oxygen oxidizes non-metals, metals and inorganic compounds.

For example,

Carbon to carbon dioxide

C+H₂SO₄ CO₂ +H₂O +2SO₂

Sulphur to sulphur dioxide

S +H₂SO₄ 3SO₂ +2H₂O

(d) Non-volatile nature:

It has a high boiling point (356^oC) so it is considered to be non-volatile. Therefore, it is used for preparing volatile acids like hydrochloric acid, nitric acid from their salts by double decomposition reaction.

NaCl + H₂SO₄NaHSO₄ +HCl

KCl + H₂SO₄ KHSO₄ +HClQuestion 3

Give a chemical test to distinguish between:

(a) Dilute sulphuric acid and dilute hydrochloric acid

(b) Dilute sulphuric acid and conc.sulphuric acidSolution 3

(a)Bring a glass rod dipped in Ammonia solution near the mouth of each test tubes containing dil. Hel and dil. H₂SO₄each.

Dil HCl	Dil. H2SO4
White fumes of ammonium chloride	No such fumes

(b)

1. Dilute sulphuric acid treated with zinc gives Hydrogen gas which bums with pop sound.

Concentrated H₂SO₄ gives SO₂ gas with zinc and the gas turns Acidified potassium dichromate paper green.

2.Barium chloride solution gives white ppt. with dilute H₂SO₄, This white ppt. is insoluble in all acids.

Concentrated H₂SO₄ and NaCl mixture when heated gives dense white fumes if glass rod dipped in Ammonia solution is brought near it.Question 4

Name the products formed when hot and concentrated sulphuric acid reacts with the following:

(a) Sulphur

(b) NaOH

(c) Sugar

(d) Carbon

(e) CopperSolution 4

(a) When sulphuric acid reacts with sulphur the product formed is Sulphur dioxide is formed.

S +2H₂SO₄ 3SO₂ + 2H₂O

(b) When sulphuric acid reacts with sodium hydroxide it neutralizes base to form sodium sulphate.

2NaOH + H₂SO₄ Na₂SO₄ + 2H₂O

(c) When sulphuric acid reacts with sugar it forms carbon

C₁₂ H₂₂O₁₁12C + 11H₂O

(d) When sulphuric acid reacts with carbon it forms carbon dioxide and sulphur dioxide gas.

C +2H₂SO₄ CO₂ + 2H₂O + 2SO₂ 

(e) When sulphuric acid reacts with copper it forms copper sulphate and sulphur dioxide.

Cu + H₂SO₄ CuSO₄ + 2H₂O + SO₂ Question 5

Why is:

(a) Concentrated sulphuric acid kept in air tight bottles?

(b) H₂SO₄ is not a drying agent for H₂S?

(c) Sulphuric acid used in the preparation of HCl and HNO₃? Give equation in both cases.Solution 5

(a) Concentrated sulphuric acid is hygroscopic substance that absorbs moisture when exposed to air. Hence, it is stored in air tight bottles.

(b) Sulphuric acid is not a drying agent for H₂S because it reacts with H₂S to form sulphur.

H₂SO₄+H₂S 2H₂O+SO₂+S 

(c) Concentrated sulphuric acid has high boiling point (356^oC). So, it is considered to be non-volatile. Hence, it is used for preparing volatile acids like Hydrochloric acid and Nitric acids from their salts by double decomposition.

NaCl+H₂SO₄NaHSO₄ +HCl

NaNO₃ +H₂SO₄NaHSO₄ +HNO₃Question 6

What property of conc. H₂SO₄ is made use of in each of the following cases? Give an equation for the reaction in each case

(a) In the production of HCl gas when it reacts with a chlorine

(b) In the preparation of CO from HCOOH

(c) As a source of hydrogen by diluting it and adding a strip of magnesium

(d) In the preparation of sulphur dioxide by warming a mixture of conc. Sulphuric acid and copper -turnings.

(e) Hydrogen sulphide gas is passed through concentrated sulphuric acid

(f) Its reaction with (i) ethanol (ii) carbonSolution 6

(a) Due to its reducing property. i.e, it is a non-volatile acid.

NaCl+ H₂SO₄NaHSO₄ + HCl

(Conc.)

(b) It is a dehydrating agent.

HCOOH CO + H₂O

(c) Magnesium is present above hydrogen in the reactivity series so sulphuric acid is able to liberate hydrogen gas by reacting with magnesium strip.

Mg + H₂SO₄ MgSO₄+H₂

(d) Due to its oxidizing character

Cu +H₂SO₄ CuSO₄ +2H₂O +SO₂

(e) Due to its oxidizing property Hydrogen sulphide gas is passed through concentrated sulphuric acid to liberate sulphur dioxide and sulphur is formed.

H₂S + H₂SO₄ S + 2H₂O + SO₂

(f) 

(i) Ethanol

(ii) Carbon

Question 7

What is the name given to the salts of:

(a) Sulphurous acid

(b) Sulphuric acidSolution 7

The name of the salt of

(a) Hydrogen sulphites and Sulphites.

(b) Sulphate and bisulphate.Question 8

Give reasons for the following.

(a) Sulphuric acid forms two types of salts with NaOH

(b) Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide.

(c) A piece of wood becomes black when concentrated sulphuric acid is poured on it

(d) Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.Solution 8

(a) Two types of salts are formed when sulphuric acid reacts with NaOH because sulphuric acid is dibasic.

NaOH + H₂SO₄ NaHSO₄ + H₂O

2NaOH + H₂SO₄Na₂SO₄ + 2H₂O

(b) When hydrogen bromide reacts with sulphuric acid the bromine gas is obtained which produce red brown vapours.

2KBr+3H₂SO₄ 2KHSO₄+SO₂+Br₂ +2H₂O

(c) A piece of wood becomes black when concentrated sulphuric acid is poured on it because it gives a mass of carbon.

(d) When sulphuric acid is added to sodium carbonate it liberates carbon dioxide which produces brisk effervescence.

Na₂CO₃+H₂SO₄Na₂SO₄ +H₂O+CO₂ Question 9

Copy and complete the following table:

Column 1Substance reacted with acid	Column 2Dilute or concentrated acid	Column 3Gas
		Hydrogen
		Carbon dioxide
		Only chlorine

Solution 9

Column 1Substance reacted with acid	Column 2Dilute or concentrated acid	Column 3Gas
Substance reacted with acid	Dilute or concentrated sulphuric acid	Gas
Zinc	Dilute sulphuric acid	Hydrogen
Calcium carbonate	Concentrated sulphuric acid	Carbon dioxide
Bleaching power CaOCl2	Dilute sulphuric acid	only chlorine

Question 10

Following are the typical properties of dilute acid complete them by inserting suitable words:

(i) Active metal + Acid ⟶…………. + …………….

(ii) Base + Acid ⟶ ……….. + ………….

(iii) Carbonate/hydrogen carbonate + Acid ⟶ ……….+ ………….+……….

(iv) Sulphite/hydrogen sulphite + Acid ⟶ ………..+………….+………..

(v) Sulphite + Acid ⟶ ……….. +………….Solution 10

(i) Active metal + Acid ⟶ Metal sulphate + Hydrogen

(ii) Base + Acid ⟶ Salt + Water

(iii) Carbonate/hydrogen carbonate + Acid ⟶ Salt + Water + Carbon dioxide

(iv) Sulphite/hydrogen sulphite + Acid ⟶ Salt + Water + Sulphur dioxide

(v) Sulphite + Acid ⟶ Salt + Hydrogen sulphideQuestion 11(a)

Which property of sulphuric acid accounts for its use as a dehydrating agent?Solution 11(a)

Sulphuric acid is powerful dehydrating agent on account of its strong affinity towards water.Question 11(b)

Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Write one equation. Each to illustrate the above mentioned properties of sulphuric acid.Solution 11(b)

Concentrated sulphuric acid as

 i. Oxidising agent:

 The oxidising property of conc. sulphuric acid its due to the fact that on thermal decomposition, it yeilds nacent oxygen [O].

 H₂SO₄→ H₂O + SO₂ + [O] 

 ii. Non-volatile acid:

 conc. sulphuric acid has high boiling point (338°C) that why it is said to be a non volitile compound, therefore it is used for preparing volatile acids like hydrochloric acids, nitric acids from there salts by double decomposition

  H₂SO₄ + NaCl → NaHSO₄ + HClQuestion 12

Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reactions (i) to (v). Some properties may be repeated:

A. Acid

B. Dehydrating agent

C. Non-volatile acid

D. Oxidising agent

(i) C₁₂H₂₂O₁₁ +nH₂SO₄ 12C + 11H₂O + nH₂SO₄

(ii) S + 2H₂SO₄ 3SO₂ +2H₂O

(iii) NaCl +H₂SO₄ NaHSO₄ + HCl

(iv) CuO + H₂SO₄ CuSO₄ +H₂O

(v) Na₂CO₃ + H₂SO₄ Na₂SO₄ + H₂O +CO₂Solution 12

(i) B

(ii) D

(iii) C

(iv) A

(v) AQuestion 13

(a) Name the acid formed when sulphur dioxide dissolves in water.

(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.Solution 13

(a) The acid formed when sulphur dioxide dissolves in water is sulphurous acid.

(b) Carbondioxide gas is released when sodium carbonate is added to solution of sulphur dioxide.Question 2008

1. Dilute sulphuric acid will produce a white precipitate when added to a solution of :

 i. Copper nitrate

 ii. Zinc nitrate

 iii. Lead nitrate

 iv. Sodium nitrate

2. Identify the following substance: Liquid E can be dehydrated to produce ethene.

c. Copy and complete the following table relating to an important industrial process and its final output.

Name of process	Inputs	Catalyst	Equation for catalyzed reaction output
Contact process	Sulphur dioxide + oxygen

4. Making use only of substances given : dil. sulphuric acid, sodium carbonate, zinc, sodium. sulphite, lead, calcium carbonate : Give equations for the reactions by which you could obtain :

 i. hydrogen

 ii. sulphur dioxide

 iii. carbon dioxide

 iv. zinc carbonate [2 steps]

5. What property of conc. H₂SO₄ :

 i. is used in the action when sugar turns black in its presence.

 ii. allows it to be used in the preparation of HCl and HNO₃ acids.

f. Write the equations for :

 i. dil. H₂SO₄ and barium chloride

 ii. dil. H₂SO₄ and sodium sulphuideSolution 2008

a. (C) Lead nitrate

b. Liquid E is Ethanol.

c. 

Name of process	Inputs	Catalyst	Equation for catalyzed reaction output	output
Contact process	Sulphur dioxide + oxygen	Platinum or V2O5	2SO2 + O2 ⇄ 2SO3	Sulphuric acid

d.  

 i. Zn + dil. H₂SO₄→ ZnSO₄ + H₂ 

 ii. Na₂CO₃ + dil. H₂SO₄→ Na₂SO₄ + H₂O + CO₂

 iii. Pb(NO₃) + dil. H₂SO₄→ PbSO₄  + 2HNO₃

 iv. Zn + dil. H₂SO₄→ ZnSO₄ + H₂

ZnSO₄ + Na₂CO₃→ ZnCO₃ + Na₂SO₄

e.  

 i. The property of concentrated sulphuric acid which allows it to be used in is used in the action when sugar turns black in its presence is its dehydrating property. 

 ii. The property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid is its non-volatility.

H₂SO₄ + BaCl₂ →  BaSO₄ + 2HClQuestion 2009

a. Name the gas evolved [formula is not acceptable]. The gas that can be oxidised to sulphur.Solution 2009

Hydrogen ChlorideQuestion 2010

a. Give the equation for :

 i. Heat on sulphur with conc. sulphuric acid

 ii. Reaction of - sugar with conc. sulphuric acid.

b. Give a balanced equation for the conversion of zinc oxide to zinc sulphate.

c. Select the correct answer from A, B, C.

A. Sodium hydroxide solution

B. A weak acid

C. Dilute sulphuric acid.

The solution which liberates sulphur dioxide gas, from sodium sulphite.Solution 2010

a.  

 i. S + H₂SO₄ → 3SO₂ +2H₂O.

 ii. C₁₂H₂₂O₁₁  + Conc. H₂SO₄ → 6C + 6H₂O

b. ZnO + H₂SO₄ → ZnSO₄ + H₂O. 

c. C) Dilute sulphuric acid. Question 2011

a. State your observation when - Sugar crystals are added to a hard glass test tube containing conc. sulphuric acid.

b. Choose the correct answer from the choices - The gas evolved when dil. sulphuric acid reacts with iron sulphide.

 i. Hydrogen sulphide

 ii. Sulphur dioxide

 iii. Sulphur trioxide

 iv. Vapour of sulphuric acid

c. Give a balanced equation for :

 i. Dilute sulphuric acid is poured over sodium sulphite.

 ii. Manufacture of sulphuric acid by the - contact process.

d. State the property of sulphuric acid shown by the reaction of conc. sulphuric acid when heated with

 i. potassium nitrate

 ii. carbonsSolution 2011

a. Charring of sugar takes place. Sulphuric acid dehydrates sugar leaving behind carbon which is black in colour.

b. i. Hydrogen sulphide

c. i. 

ii.

d. 

 i. Non-volatile nature

 ii. as an oxidising agentQuestion 2012

a. Name - The gas produced on reaction of dilute sulphuric acid with a metallic sulphide.

b. Some properties of sulphuric acid are listed below. Choose the role played by sulphuric acid as A, B, C or D which is responsible for the reactions (i) to (v). Some role/s may be repeated.

 1. Dilute acid

 2 Dehydrating agent

 3. Non-volatile acid

 4. Oxidising agent

c. Give balanced equation for the reaction : Zinc sulphide and dilute sulphuric acid.Solution 2012

a. Hydrogen Sulphide (H₂S).

b. 

 i. (B) Dehydrating agent

 ii. (D) Oxidising agent

 iii. (C) Non-volatile acid

 iv. (A) Dilute acid

 v. (D) Oxidising agent

c. ZnS + dil.H₂SO₄→ ZnSO₄ + H₂SQuestion 2013

a. State one appropriate observation for : Conc. H₂SO₄ is added to a crystal of hydrated copper sulphate.

b. In the given equation - S + 2H₂SO₄→ 3SO₂ + 2H₂O :

 Identify the role played by conc. H₂SO₄.

 i. Non-volatile acid

 ii. Oxidising agent

 iii. Dehydrating agent

 iv. None of the above

c. Give a balanced equation for : Dehydration of concentrated sulphuric acid with sugar crystals.

d. Identify the substance underlined : A dilute mineral acid which forms a white precipitate when treated with barium chloride solution.Solution 2013

a. when Conc. H₂SO₄ is added to a crystal of hydrated copper sulphate,it removes water of crystalisation from salt.

b. ii. Oxidising agent 

c. C₁₂H₂₂O₁₁ + Conc. H₂SO₄ → 6C + 6H₂O

d. Sulphuric acid (H₂SO₄)Question 2014

a. Write balanced equations for the following : Action of concentrated sulphuric acid on carbon.

b. Distinguish between the following pairs of compounds using the test given within brackets. Dilute sulphuric acid and dilute hydrochloric acid [using barium chloride solution].

c. State the conditions required for the following reactions to take place : The conversion of sulphur dioxide to sulphur trioxde.

d. Give one equation each to show the following properties of sulphuric acid :

 i. Dehydrating property

 ii. Acidic nature

 iii. As a non-volatile acidsSolution 2014

a. C + H₂SO₄ → CO₂ + 2H₂O + 2SO₂.

b. Sulphuric acid precipitates the insoluble sulphate of barium from the solution of barium chloride.

BaCl₂ + H₂SO₄→ BaSO₄ + 2HCl

Dilute HCl does not react with barium chloride solution, and thus, no precipitate is produced in the reaction.

c. Two conditions for the conversion of sulphur dioxide to sulphur trioxide is as follows: 

Temperature: 450-500° C Catalyst: V₂O₅

d.  

 i. Dehydrating property of sulphuric acid:

H₂SO₄ has a great affinity for water, and therefore, it acts as a dehydrating agent. 

 ii. Acidic nature of sulphuric acid:

 It acts as a strong dibasic acid.

 H₂SO₄→ 2Hi⁺ + SO₄^2-

 It reacts with metals, metal oxides, metal hydroxides, carbonates etc. to form metallic sulphates and hydrogen at ordinary temperature.

 Mg + H₂SO₄→ MgSO₄ + H₂↑ 

 CuO + H₂SO₄→ CuSO₄ + H₂O

 2NaOH + H₂SO₄→ Na₂SO₄ + 2H₂O

 ZnCO₃ + H₂SO₄→ ZnSO₄ + H₂O + CO₂↑ 

 iii. As a non-volatile acid:  

It has a high boiling point, so it is used to prepare volatile acids such as HCl, HNO₃ and acetic acid from their salts.

NaCl + H₂SO₄→ NaHSO₄ + HCl

NaNO₃ + H₂SO₄→ NaHSO₄ + HNO₃

CH₃COONa + H₂SO₄→ NaHSO₄  + CH₃COOHQuestion 2015

(a) In the manufacture of sulphuric acid by contact process, give the equations for the conversion of sulphur trioxide to sulphuric acid.

(b) Give equations for the action of sulphuric acid on

(i) Potassium hydrogen carbonate

(ii) Sulphur

(c) Identify the acid in each case.

(i) Acid which produces sugar charcoal from sugar

(ii) Acid on mixing with lead nitrate solution produces white ppt. which is insoluble even on heatingSolution 2015

(a) In the contact process for the manufacture of sulphuric acid, the equations for the conversion of sulphur trioxide to sulphuric acid are

 SO₃ + H₂SO₄ → H₂S₂O₇

  (oleum or pyrosulphuric acid)

 H₂S₂O₇ + H₂O → 2H₂SO₄

(b)  

(i) Action of sulphuric acid on potassium hydrogen carbonate

 2KHCO₃+ H₂SO₄→ K₂SO₄+ 2H₂O + 2CO₂↑ 

(ii) Action of sulphuric acid on sulphur

 S + 2H₂SO₄→ 3SO₂ + 2H₂O

(c)  

(i) Concentrated sulphuric acid

(ii) Concentrated sulphuric acid