Sulphuric Acid ICSE Class-10 Concise Selina Solutions

Study of Compound-D Sulphuric Acid Concise (Selina Publications ) Solution

Sulphuric Acid ICSE Class-10 Concise Chemistry Selina Solutions Chapter-11 Study of Compound D. We Provide Step by Step Answer of Intext , Exe-8  and  Previous Year Questions of Chapter-11 Sulphuric Acid Study of Compound-D ICSE Class-10 . Visit official Website CISCE  for detail information about ICSE Board Class-10.

Sulphuric Acid ICSE Class-10 Concise Chemistry Selina Solutions Chapter-11 (Study of Compound-D)


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How to solve Sulphuric Acid Chemistry for ICSE Class 10

Read the Chapter -11 Sulphuric Acid  carefully. Focus on reaction involve in Chemical Properties of Sulphuric Acid. Various Step involve with reaction in Purification of Sulphuric Acid . Lab Preparation of Sulphuric Acid .Solve 10 Years Question given related Sulphuric Acid given last of exercise. For more practice on Sulphuric Acid  try to solve exercise of other publications such as Goyal Brothers Prakshan / new Simplified Dr Dalal Chemistry.


Intext , Chapter-11 Sulphuric Acid ICSE Class-10

Question 1

Comment, sulphuric acid is referred to as

(a) King of chemicals

(b) Oil of vitriol

Answer 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.

Answer 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-450oC

(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?

Answer 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.

Answer 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) SO+ H2SO4H2S2O7

(ii) H2S2O7 + H2O 2H2SO4

(c)The substance that will liberate sulphur dioxide in step E is dilute H2SO4.

(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


Exercise-11 , Sulphuric Acid ICSE Class-10 Chemistry Selina Publishers

Question 1

Why is water not added to concentrated H2SOin order to dilute it?

Answer 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 nature

Answer 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+H2SOCuSO4+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+H2SOCO2 +H2O +2SO2

Sulphur to sulphur dioxide

S +H2SO3SO2 +2H2O

(d) Non-volatile nature:

It has a high boiling point (356oC) 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 + H2SOKHSO4 +HCl

Question 3

Give a chemical test to distinguish between:

(a) Dilute sulphuric acid and dilute hydrochloric acid

(b) Dilute sulphuric acid and conc.sulphuric acid

Answer 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) Copper

Answer 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 + H2SO    Na2SO4 + 2H2O

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

C12 H22O11              12C + 11H2O

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

C +2H2SO4    CO2 + 2H2O + 2SO

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

Cu + H2SO  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.

Answer 5

(a) Concentrated sulphuric acid is hydroscopic 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+H2  2H2O+SO2+S 

(c) Concentrated sulphuric acid has high boiling point (356oC). 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+H2SO4         NaHSO4 +HCl

NaNO3 +H2SO4       NaHSO4 +HNO3

Question 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) carbon

Answer 6

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

NaCl+ H2SO NaHSO4 + 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 acid

Answer 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.

Answer 8

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

NaOH + H2SO     NaHSO4 + H2O

2NaOH + H2SO   4Na2SO4 + 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+H2SO4     Na2SO+H2O+CO2 

Question 9

Copy and complete the following table:

Column 1

Substance reacted with acid

Column 2

Dilute or concentrated acid

Column 3

Gas

Hydrogen
Carbon dioxide
Only chlorine

 

Answer 9

 

Column 1

Substance reacted with acid

Column 2

Dilute or concentrated acid

Column 3

Gas

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

Give the odour of gas evolved and name the gas produced when sodium sulphide is added to solution of HCl in water.

Answer 10

When sodium sulphide is added to solution of HCl, Hydrogen sulphide gas is produced. It has rotten egg like smell.

Question 11

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

(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.

Answer 11

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

(b) Concentrated sulphuric acid as

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 + SO+ [O]

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 + HCl

Question 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.  Typical 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    NaHSO+ HCl

(iv) CuO + H2SO4     CuSO4 +H2O

(v) Na2CO3 + H2SO4    Na2SO4 + H2O +CO2

Answer 12

(i) B

(ii) D

(iii) C

(iv) A

(v) A

Question 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.

Answer 13

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

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


Chapter-11 , Sulphuric Acid Selina Solution  (Previous Year Question)

Question 2008

(a) 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

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

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]

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.

(iii) Write the equations for :

(iv) dil. H2SO4 and barium chloride

(v) dil. H2SO4 and sodium sulphuide

Answer 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→ PbSO + 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.

H2SO+ BaCl2 →  BaSO+ 2HCl

Question 2009

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

Answer 2009 

Hydrogen Chloride

Question 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 zincsulphate.

(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.

Answer 2010 

(a)

(i) S + H2SO4 → 3SO2 +2H2O.

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

(b) ZnO+ H2SO→ 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) carbons

Answer 2011 ( Sulphuric Acid ICSE Class-10 )

(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 agent

Question 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

  1. 3.Non-volatile acid
  2. 4.Oxidising agent

(c) Give balanced equation for the reaction : Zinc sulphide and dilute sulphuric acid.

Answer 2012 ( Sulphuric Acid ICSE Class-10 )

(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 + H2S

Question 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.

Answer 2013

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

(b) ii.Oxidising agent

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

(d) Sulphuric acid (H2SO4)

Question 2014 ( Sulphuric Acid ICSE Class-10 )

(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 acids

Answer 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+ + SO42-

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→ NaHSO+ HCl

NaNO3 + H2SO4→ NaHSO+ HNO3

CH3COONa + H2SO4→ NaHSO4  + CH3COOH

Question 2015 ( Sulphuric Acid ICSE Class-10 )

(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 heating

Answer 2015

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

SO+ H2SO→ H2S2O7

(oleum or pyrosulphuric acid)

H2S2O+ 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→ 3SO+ 2H2O

(c)

(i) Concentrated sulphuric acid

(ii) Concentrated sulphuric acid

-: End of Sulphuric Acid ICSE Class-10 :-

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