Give one word/ Name
Q
From the following gases – ammonia, chlorine, hydrogen chloride, Sulphur dioxide, select the
gas that matches the description given below and answer the questions that follow: Gas A is a
reducing agent which contains oxygen.
(a) What is the name of the gas A?
(b) What would you observe if gas A is bubbled through acidified potassium dichromate
solution.
Q
From the gases – ammonia, hydrogen chloride, hydrogen sulphide, Sulphur dioxide – select the
following:
(a) This gas can be oxidized to Sulphur.
(b) This gas decolourises potassium permanganate solution.
(c) This gas can be obtained by the reaction between copper and concentrated sulphuric acid.
Q
Name a gas which smells of rotten eggs.
Q
Select the correct compound from the list given – Ammonia, Copper oxide, Copper sulphate,
Hydrogen chloride, Hydrogen sulphide, Lead bromide – which matches the description given
below: The compounds smells of rotten eggs.
Q
Identify the following substances (a) Gas C has a smell like rotten eggs. (b) Gas D is colourless
gas which can be used as a bleaching agent. (c) Liquid E can be dehydrated to produce ethane.
Q
What property of conc. H2SO4 is used in the action when sugar turns black in its presence.
Q
Which property of conc. H2SO4 allows it to be used in the preparation of HCl and HNO3 acids.
Q
Explain a reagent chosen from :- ammonium hydroxide, barium chloride, sodium hydroxide,
sulphuric acid and nitric acid enables to distinguish between the two acids mentioned there in.
.
Q
State the substance/s reacted with dilute or concentrated sulphuric acid to form the following
gases : [i] Hydrogen [ii] Carbon dioxide. State whether the acid used in each case is dilute or
concentrated.
Q
State the name of the process by which H2SO4 is manufactured. Name the catalyst used.
Q
From the gases ammonia, hydrogen chloride, hydrogen sulphide, sulphur dioxide – Select the
following :
i.
ii.
iii.
Q
This gas can be oxidized to sulphur.
This gas decolourises potassium permanganate solution.
This gas can be obtained by the reaction between copper and concentrated sulphuric acid.
Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide.
Q
What type of substance will liberate sulphur dioxide from sodium sulphite.
Q
State the colour of the precipitate formed when H2S is bubbled through copper sulphate solution.
Q
When burning sulphur [i.e. SO2] reacts with H2O , a compound is formed. Name the compound.
Q
When H2S reacts with oxidizing agents, what substances is always a product of the reaction.
Q
Name the oxide of sulphur which reacts with water to give sulphuric acid.
Q
In the Contact Process, the direct reaction between oxide of sulphur and water is avoided. In this
process, What does the oxide of sulphur react with instead of water and what is the name of the
product ?
Q
(a) A compound X is warmed with dil. sulphuric acid. It gives off a colourless gas which turns
acidified potassium dichromate paper green. Name the anion present in the compound. [1]
Q
Give two large-scale uses of sulphur dioxide.
Q
Give one large scale use of sulphur. [2]
Q
State whether the following reactions are addition/reduction/oxidation/reactions :
(i) Acidified potassium dicromate to chromium sulphate.
(ii) Chlorine to sulphuryl chloride.
(iii) Hydrogen sulphide to sulphur.
(iv) Iron (III) sulphate to iron (II) sulphate.
(v) Chlorine water to hydrochloric acid.
Q
Dilute sulphuric acid will produce a white precipitate when added to a solution of :
A: Copper nitrate, B: Zinc nitrate,
C: Lead nitrate, D: Sodium nitrate.
Q
Which of the following reactions is used to prepare sulphuryl chloride.
A: Adding conc. H2SO4 to a chloride.
B: Passing SO2 through a solution of chlorine.
C: Reacting dry SO2 and dry chlorine.
D: Reacting dil. H2SO4 with a solution of chlorine.
Q
Choose the property of sulphuric acid (A, B, C or D), which is relevant to each of the
preparations [a] to [c]
A: Dil. acid (typical acid properties), B: Non-volatile acid, C: Oxidizing agent, D: Dehydrating
agent.
(a) Preparation of hydrogen chloride.
(b) Preparation of ethane from ethanol.
(c) Preparation of copper sulphate from copper oxide.
Q
Which property of sulphuric acid accounts for its use as a dehydrating agent.
Q
Supply the word (or words) that will make the sentence into a correct statement and rewrite the
sentence. Copper sulphate crystals are dehydrated by sulphuric acid.
Q
Name the process used for the large scale manufacture of sulphuric acid.
Q
State the substance/s reacted with dilute or concentrated sulphuric acid to form the following
gases: (a) Hydrogen (b) Carbon dioxide.
State whether the acid used in each case is dilute or concentrated.
Q
i.
ii.
iii.
iv.
v.
vi.
Name the oxide of Sulphur which reacts with water to give sulphuric acid.
In the Contact Process, the direct reaction between oxide of Sulphur and water is
avoided. In this process, what does the oxide of Sulphur react with instead of water and
what is the name of the product?
(a) What is the purpose of the Contact Process.
(b) Name the catalyst used in the Contact Process.
(c) Write the balanced equation for the reaction in the process which takes place in the
presence of catalyst.
(a) Name the catalyst used industrially which speeds up the conversion of SO2 and SO3in
the production of sulphuric acid in the laboratory or industrially.
(b) Write the equation for the conversion of Sulphur dioxide to Sulphur trioxide. Why
does this reaction supply energy.
(c) What is the name of the compound formed between SO3 and sulphuric acid.
State the name of the process by which H2SO4 is manufactured. Name the catalyst used.
Name the catalyst which helps in the conversion of Sulphur dioxide to Sulphur trioxide.
Q
When H2S reacts with oxidizing agents, what substance is always a product of the reaction.
Q
State the colour of the precipitate formed when H2S is bubbled through copper sulphate
solution.
Q
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. Oxidizing agent.
i.
ii.
iii.
iv.
v.
C12H22O11 + nH2SO4 → 12C + 11H2O + nH2SO4
S + 2H2SO4 → 3SO2 + 2H2O
NaCl + H2SO4 → NaHSO4 + HCl
CuO + H2SO4 → CuSO4 + H2O
Na2CO3 + H2SO4 → Na2SO4 + H2O + CO2
Q
Name the acid formed when sulphur dioxide dissolves in water.
Q
Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.
Q
What are the two necessary conditions for the direct combination of sulphur dioxide and
Q
chlorine forming sulphuryl chloride ?
State the property of sulphur dioxide which causes potassium permanganate to change its
colour from purple to colourless.
Q
HCl, HNO3 and H2SO4 are the formulae of three compounds. Which of these compounds has
the highest boiling point and which has the lowest.
Q
State two properties of sulphur dioxide which lead to its storage in large volumes.
Q
Name a gas which is called acid anhydride of sulphurous acid. Give one reason.
Q
Name two gas which on passing through lime water, trun it milky. Write chemical equations in
support of your answer. [3]
Q
Name a catalyst used in contact process for the manufacture of sulphuric acid. [2]
Q
What is the name given to the salts of sulphurous acid? [1]
Q
Give the formula of the substance which is responsible for tarnish on silver spoon.
Q
What is the formula for anhydride of sulphuric acid ?
Q
(a) Name all the products formed when :
(i) copper is heated with conc. sulphuric acid.
(ii) chlorine gas is passed through sulphurous acid.
Q
What is the function of concentrated sulphuric acid in the preparation of carbon monoxide from
oxalic acid?
Q
Name two gases which combine during the contact process.
Q
(i) Name two acids which can be prepared by using sulphuric acid?
(ii) Name the another metal sulphide [excluding Iron pyrites] which on roasting produces
catalyst.
sulphur
Fill in the blanks
Select the correct answer from choices in brackets.
Q
“Concentrated sulphuric acid is used in the laboratory preparation of nitric acid and
hydrochloric acid because it is ___________ [less volatile/stronger] in comparison to these two
acids.”
Q
The reduced product obtained when hydrogen sulphide reacts with conc. sulphuric acid is
__________ [SO2 /S/H2O].
Q
The dehydrated product obtained when sugar reacts with conc. sulphuric acid is __________
[CO2 /CO/C].
Q
The salt which reacts with dil. sulphuric acid to form insoluble ppt is __________ [Pb(NO3 )2
/NaNO3 /Cu(NO3 )2 ].
Q
The oxidised product obtained when sulphur reacts with conc. sulphuric acid is __________ [H2
SO3 /H2 S/SO2 ].
Q
The type of salt formed when excess of caustic soda reacts with sulphuric acid is __________
[normal salt/acid salt].
[5]
Match the following
Q
“Sulphur trioxide and water react to form sulphuric acid.” Sulphuric acid may act as each of the
following :
(1) An acid, forming sulphates which are soluble in water.
(2) A compound, forming sulphates which are insoluble in water.
(3) A dehydrating agent.
(4) A drying agent.
(5) An oxidising agent.
Which ONE of the above properties 1 to 5 are shown by sulphuric acid when :
(i) concentrated sulphuric acid is added to sugar?
(ii) dilute sulphuric acid reacts with lead nitrate?
(iii) dilute sulphuric acid is added to sodium hydroxide solution?
(iv) hydrogen sulphide gas is passed through concentrated sulphuric acid?
Distinguish/Differentiate/Similarities
Q
Give one similarity and two differences between bleaching action of SO2 gas and chlorine gas.
Q
What is the similarity in the use of sulphur dioxide and chlorine as bleaching agents.
Q
Dilute hydrochloric acid and dilute sulphuric acid are both colourless solutions. How will the
addition of barium chloride solution to each help to distinguish between the two
Q
Both chlorine and sulphur dioxide bleach moist litmus paper.How would you distinguish between
these two gases by a chemical test?
Q
State two differences between the bleaching action of sulphur dioxide and chlorine.
[2]
Q
How would you distinguish between sulphur dioxide gas and hydrochloric acid gas? 2]
Q
By describing one chemical test in each case explain, how you will distinguish between
sulphur dioxide gas and hydrochloric acid gas. [2]
Q
State one similarity and three differences between bleaching action of chlorine and sulphur
dioxide gas.
Q
Distinguish between a drying agent and dehydrating agent.
What do you observe
Q
Write the observations and balanced equations for the reaction: A paper dipped in potassium
permanganate solution is put on the mouth of a test-tube containing Sulphur dioxide gas.
Q
State what is observed when Sulphur dioxide is passed through a jar containing bromine water.
Q
What do you see when concentrated sulphuric acid is added to copper sulphate-5-water.
Q
What do you observe when barium chloride solution is added to dilute sulphuric acid.
Q
What is observed when hydrogen sulphide gas is passed through lead acetate solution.
Q
State what will you observe and write chemical equations when sulphur dioxide gas is passed
through aqueous and acidified solution of (a) KMnO4 (b) K2Cr2O7.
[4]
Q
What will you observe when concentrated sulphuric acid is poured on (i) sugar crystals (ii) copper
sulphate crystals?
Q
Describe the change you would observe :
(i) When concentrated sulphuric acid is added to sugar.
(ii) When concentrated sulphuric acid is added to formic acid, HCOOH, and warmed
Q
State your observations when a crystal of CuSO4· 5H2O is placed in concentrated sulphuric acid.
State one reason for your observation.
(i) Describe another way by which the same effect can be produced.
(ii) What is the meaning of term “water of crystallisation?”
[3]
Give Reason
Q
The bleaching action of Cl2 is permanent whereas the bleaching action of SO2 is temporary.
(a) Give a reason why chlorine is not used to bleach silk.
(b) State the similarity in the use of Sulphur dioxide and chlorine as bleaching agent.
(c) Explain the bleaching action of Sulphur dioxide with the help of chemical equations.
(d) Why is bleaching by Sulphur dioxide only temporary.
Q
Give a reason why Sulphur dioxide is used as an antichlor.
Q
In the Contact Process, the direct reaction between oxide of Sulphur and water is avoided. In
this process, what does the oxide of Sulphur react with instead of water and what is the name of
the product?
Q
State how you can obtain H2S from iron (II) sulphide.
Q
Explain how a reagent chosen from ammonium hydroxide, barium chloride, sodium chloride,
sodium hydroxide, sulphuric acid and nitric acid enables to distinguish between the two acids
mentioned therein.
Q
Why is bleaching of colouring matter by sulphur dioxide is termed as reduction reaction?
Q
Why is bleaching done by sulphur dioxide temporary in nature?
Q
How is sulphuric acid prepared industrially by contact process? Support your answer by writing
fully balanced chemical equations.Why is sulphur trioxide formed in this process not absorbed
directly in water?
Q
Why is vanadium pentoxide considered a better catalyst than platinised asbestos?
Q
Why is heating of catalyst discontinued the moment when the oxidation of sulphur dioxide takes
place? [2 each]
Q
Why are the wooden shelves on which concentrated sulphuric acid bottles kept, stained black? [2]
[2]
Q
Why is concentrated sulphuric acid always added to water and not the water to concentrated
sulphuric acid? Why does the mixture get hot? [3]
Q
In contact process, sulphur dioxide can be oxidised to sulphur trioxide in the presence of
platinised asbestos, which acts as a catalyst. The reaction is exothermic. Explain what is meant by
the terms in bold italics.
(b) Give examples of the use of sulphuric acid.
(1) As an electrolyte in everyday use. (2) As non-volatile acid.
(3) As an oxidising agent.
(c) Why is a black spongy mass formed when concentrated sulphuric acid is added to
sugar?
(d) Silver cannot be used to prepare hydrogen from hydrochloric acid or sulphuric acid.
Why?
Q
The following statements are correct only, under certain conditions. Rewrite each of the
statement, including appropriate condition (s) and underline them.
(i) Sulphur dioxide is a bleaching agent.
(ii) Oxalic acid and sulphuric acid react to produce carbon monoxide and carbon dioxide. [2]
Q
Whenever water is added to concentrated sulphuric acid or concentrated sulphuric acid is added
to water, a large amount of heat is liberated. But the acid dangerously spurts out only when water
is added to the concentrated acid. Explain the above observation giving a reason. 4]
Q
In the manufacture of sulphuric acid by contact process, great care is taken to purify the mixture
of air and sulphur dioxide, especially to free it from arsenic impurities. Explain.
Q
Concentrated sulphuric acid should be kept in air-tight bottles.
Q
When blue copper sulphate crystals are added to concentrated sulphuric acid, they turn white.
Explain. [2]
[2]
Chem Reaction
Q
Give equations for the following conversions:
a.
b.
c.
Q
Sulphur dioxide to Sulphur
Sulphur dioxide to sodium sulphite
sodium sulphite to Sulphur dioxide.
Write the equation for the laboratory preparation of Sulphur dioxide from sodium sulphite.
a. How is the SO2 collected?
b. What does the method of collection tell you about the density of SO2?
c. What do you see when SO2 is bubbled through an acidified K2Cr2O7 solution?
Q
Write one equation in each case to show the action of Sulphur dioxide as:
a. a reducing agent
b. an oxidizing agent
c. an acid anhydride.
Q
When burning Sulphur [i.e. SO2] reacts with H2O, a compound is formed. Name the compound.
(i) Give the balanced equation for reaction between SO2 and moist Cl2.
(ii) Write a balanced equation for: SO2 and sodium hydroxide solution. [formation of normal
salt].
(iii) What type of substance will liberate Sulphur dioxide from sodium sulphite.
(viii) Write the equation for the reaction by which Sulphur dioxide is converted into sodium
sulphite.
Q
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-step procedure is used. Write the
equations for the two steps involved.
Q
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
xi.
Write correctly balanced equation for the reaction between Iron and dilute sulphuric acid.
Write correctly balanced equations for the reaction of dilute sulphuric acid with each of
the following
(a) Copper carbonate
(b) Lead nitrate solution
(c) Zinc hydroxide.
Write a balanced equation for the reaction between zinc and dilute sulphuric acid.
Write equation for
(a) Dilute H2SO4 – producing H2.
(b) Between Pb(NO3)2 solution and dil. H2SO4.
Write the equation for the laboratory preparation of:
(a) Sodium sulphate using dilute sulphuric acid.
(b) Lead sulphate using dilute sulphuric acid.
Write balanced equation for the reaction between
(a) Potassium hydrogen carbonate and dilute sulphuric acid.
(b) Sodium nitrate and concentrate sulphuric acid.
Write the equations for the laboratory preparation of the following salts using sulphuric
acid.
(a) Copper sulphate from copper.
(b) Lead sulphate from lead nitrate.
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.
Write the equation for the following reaction : Sulphur dioxide and water.
Copy and complete the following table relating to an important industrial process and its
final output.
Name of
process
Inputs
Contact
process
Sulphur
dioxide +
oxygen
Catalyst
Equation for
catalyzed
reaction
Output
Making use only of substance given : dil. Sulphuric acid, Sodium carbonate, Zinc,
Sodium sulphite, Lad, Calcium carbonate : Give equations for the reactions by which you
could obtain : (a) hydrogen (b) sulphur dioxide (c) carbon dioxide (d) zinc carbonate [2
steps required].
Write the equation for (a) dil. H2SO4 and barium chloride, (b) dil. H2SO4 and sodium
sulphide
Q
A mixture of iron dust (iron fillings) and sulphur was heated. The black solid residue M reacts
with dilute sulphuric acid to give a foul smelling gas N. N when ignited burned with a blue
flame and deposited a yellow residue O. On passing N into lead (II) nitrate solution, it gave a black
precipitate P and a colourless solution Q. Name the substances M, N, O, P and Q and write an
Equation for each.
[5]
Q
Write the equation for the laboratory preparation of sulphur dioxide from sodium sulphite. [ii]
How is the SO2 collected ? [iii] What does the method of collection tell you about the density of
SO2 ? [iv] What do you see when SO2 is bubbled through an acified K2Cr2O7 solution ?
Q
Write one equation in each case to show the action of sulphur dioxide as :
i.
ii.
iii.
a reducing agent;
an oxidizing agent;
an acid anhydride.
Q
Write correctly balanced equation for the following reaction – Iron and dilute sulphuric acid.
Q
Write correctly balanced equation for the reaction of dilute sulphuric acid with each of the
following :
i.
ii.
iii.
Copper carbonate
Lead nitrate solution
Zinc hydroxide
Q
Write a balanced equation for the reaction between zinc and dilute sulphuric acid.
Q
Give the balanced equation for reaction between SO2 and moist Cl2.
Q
What is the purpose of the Contact Process. Name the catalyst used in the Contact Process. Write
the balanced equation for the reaction in the process which takes place in the presence of the
catalyst.
Q
Write a balanced equation for : SO2 and sodium hydroxide soln. [formation of normal salt].
Q
State how you can obtain : H2S from iron (II) sulphide.
Q
Write the balanced equations for dilute HCl and sodium sulphite.
Q
Write equations for :- [i] Dil H2SO4 – producing H2, [ii] Between Pb(NO3)2 soln. & dil. H2SO4.
Q
Write the equations for the laboratory preparation of : [i] Sodium sulphate using dilute sulphuric
acid. [ii] Lead sulphate using dilute sulphuric acid.
Q
Write the observations and balanced equations for the reaction : A paper dipped in potassium
permanganate solution is put on the mouth of a test-tube containing sulphur dioxide gas.
Q
Write the equations for the laboratory preparation of the following salts using sulphuric acid :
i.
ii.
Copper sulphate from copper
Lead sulphate from lead nitrate.
Q
Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite.
Q
The bleaching action of Cl2 is permanent whereas the bleaching action of SO2 is temporary.
i.
ii.
iii.
iv.
Give the reason why chlorine is not used to bleach silk.
State the similarity in the use of sulphur dioxide and chlorine as bleaching agents.
Explain the bleaching action of sulphur dioxide with the help of chemical equation.
Why is bleaching by sulphur dioxide only temporary.
Q
Name one catalyst used industrially which speeds up the conversion of SO2 to SO3 in the
production of sulphuric acid in the laboratory or industrially. Write the equation for the
conversion of sulphur dioxide to sulphur trioxide. Why does this reaction supply energy. What is
the name of the compound formed between SO3 and sulphuric acid.
Q
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-step procedure is used. Write the
equations for the two steps involved.
Q
Write balanced equations for the following reactions :
i.
ii.
Q
Potassium hydrogen carbonate and dilute sulphuric acid.
Sodium nitrate and concentrated sulphuric acid.
Write balanced equation for the following reactions :
i.
ii.
iii.
Lead sulphate from lead nitrate solution and dilute sulphuric acid.
Copper sulphate from copper and concentrated sulphuric acid.
Ammonium sulphate from ammonia and dilute sulphuric acid.
Q
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.
Q
Write equations for the preparation of sulphur dioxide gas from :
(i) sodium sulphite (ii) sodium bisulphite
[2]
Q
Write equation for the preparation of sulphur dioxide from conc. sulphuric acid and copper.
[1]
Q
How can you obtain sulphur dioxide from (i) sulphur (ii) ZnS and (iii) FeS2
Q
By writing the chemical equations, name the acid obtained when (a) sulphur dioxide (b) sulphur
trioxide is dissolved in water.
Q
How will you obtain (a) normal salt (b) an acid salt, starting from sodium hydroxide and sulphur
dioxide?
Q
By stating type of reaction and chemical equation, state, how sulphur dioxide gas reacts with (i)
dry chlorine (ii) chlorine water. [4]
Q
By writing equations, state two oxidising reactions of sulphur dioxide. Name the product of
oxidation.
Q
Write fully balanced equations when :
(i) FeS2 (iron pyrites) is heated in air.
[3]
(ii) Copper turnings are heated with concentrated sulphuric acid.
(iii) Potassium bisulphite is treated with dilute hydrochloric acid.
(iv) Sulphur is burnt in air or oxygen.
[4]
Q
When sulphur is burnt in air, the gas so formed strongly fumes in moist air. Explain your answer.
Write chemical equations.
[2]
Q
Write chemical equations for obtaining the following from dil. sulphuric acid.
(a) Hydrogen (b) Carbon dioxide (c) sulphur dioxide (d) Hydrogen sulphide
(e) a normal salt (f) an acid salt
[6]
Q
Write chemical equations for the conc sulphuric acid when the products of oxidation are :
Q
How does hydrogen sulphide forms the following : (i) Lead sulphide (ii) zinc sulphide (iii) silver
sulphide (iv) copper sulphide Give the colour of sulphides and write relevant chemical equations.
[8]
Q
Write balanced equations for the following reactions.
(i) Formation of an acid salt from sulphuric acid by a sodium salt.
(ii) Formation of black spot on a piece of wood due to conc. sulphuric acid.
(iii) Formation of sulphur dioxide gas using a metal below hydrogen in activity series.
(iv) Oxidation of a fowl smelling gas by conc. sulphuric acid.
(v) Formation of CO and CO2 by using conc. sulphuric acid.
(vi) When burning magnesium is introduced into a gas jar containing sulphur
Q
Explain, briefly how you will obtain sulphur dioxide gas from sodium sulphite.
(f) The contact process for making sulphuric acid can be outlined with four equations. Write them
down in order. [4]
Q
Write down the word equations for each of the following reactions :
(i) Conc. sulphuric acid + Copper 
(ii) Conc. sulphuric acid + Sodium chloride 
(iii) Conc. nitric acid + Copper 
(iv) Conc. hydrochloric acid + Manganese dioxide 
(v) Sodium hydroxide solution + Zinc 
Q
Write balanced molecular equations for the laboratory preparation of :
(i) Sulphur dioxide from sodium sulphite.
(ii) Chlorine by the oxidation of hydrochloric acid.
(iii) Nitrogen from ammonium nitrite. [3]
Q
Write balanced equations of the reactions in the preparation of the following : 3]
(i) ammonia from ammonium chloride.
(ii) chlorine from bleaching powder.
(iii) sulphur dioxide from sodium sulphite.
Q
Write a balanced equation for the preparation of sulphur dioxide by the action of hot conc.
sulphuric acid on sulphur
Q
Write four balanced equations for the chemical reactions taking place during contact process and
name the catalyst.
Q
Write balanced equations for obtaining the following gases from dilute sulphuric acid.
(i) hydrogen (ii) carbon dioxide (iii) sulphur dioxide.
Q
Describe in outline the chemistry of the manufacture of sulphuric acid from sulphur by contact
process. (No technical details required but equations should be given for each stage of process.)
[3]
Q
What property of sulphuric acid is made use in each of the following cases? Give an equation for
reaction in each case :
(i) Production of hydrogen chloride gas when it reacts with a chloride (say sodium chloride).
(ii) In the preparation of carbon monoxide gas from formic acid.
(iii) As a source of hydrogen by diluting it and adding a strip of magnesium.
(iv) In the preparation of sulphur dioxide by warming a mixture of concentrated sulphuric acid
and copper turning.
[4]
Q
Sulphuric acid acts as (i) an acid (ii) an oxidising agent (iii) a dehydrating agent (iv) less volatile
acid. Give one reaction each to illustrate the above properties of sulphuric acid. [5]
Q
“Sulphur dioxide is a powerful reducing agent. But it also acts as an oxidising agent”. State in
words or give balanced equations of two such reactions in which it acts as an oxidising agent. [2]
Q
Sulphurous acid is said to be a dibasic acid. What is meant by the term “dibasic”?
Q
Calculate the vapour density of sulphur dioxide gas.(S = 32; O = 16)
Q
Explain bleaching action of sulphur dioxide.
Q
Sulphuric acid can behave : [2]
(i) as an acid; (ii) as a less volatile acid;
(iii) as an oxidising agent;
certain gases. State in words, an example of each case.
(iv) as a drying agent for
Q
Both ammonia and sulphur trioxide are manufactured by catalysed reaction of gases. Give an
equation for each of these reactions and name the catalyst used in each case.
[2]
Q
State, how barium chloride solution and lead nitrate solution is used for testing the presence of
sulphate ion in sulphuric acid. Write relevant chemical equation.
[5]
Q
An important industrial reaction is represented by the equation
2SO2 + O2  2SO3.
The formation of sulphur trioxide is exothermic. State the conditions of temperature and state the
name of catalyst required for the above reaction to take place.
Q
[3]
“Sulphur dioxide acts as an oxidising agent and a reducing agent.” Give one balanced equation
for the reaction in which sulphur dioxide acts as :
(i) an oxidising agent (ii) a reducing agent.
Q
Write an equation between zinc and final product of the contact process.
[4]
Q
Write a balanced equation when sulphur dioxide gas is passed through iron (III) chloride solution.
[1]