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Sulphuric Acid Chemistry - Sulphuric Acid

ICSE - STD 10 - Chemistry (ICSE - English Medium). 72 questions in this chapter.

Question types

Sulphuric Acid question types

72 questions across 7 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

72
Questions
7
Question groups
5
Question types
Sample Questions

Sulphuric Acid questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark
Assertion (A): It is recommended to add water to a given amount of acid slowly while diluting the acid.
Reason (R): Dilution of an acid is an exothermic process.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • ✓
    A is false but R is true.

Answer: D.

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Q 2MCQ1 Mark
Assertion (A): Sulphuric acid is known as king of chemicals.
Reason (R): Sulphuric acid is used as a dehydrating agent for organic compounds.
  • A
    Both A and R are true and R is the correct explanation of A.
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: B.

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Q 3MCQ1 Mark
Assertion (A): Dilute sulphuric acid cannot be concentrated beyond 98.5% either by boiling or distillation.
Reason (R): At 98.5% concentration, sulphuric acid forms a constant boiling mixture at 338°C.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: A.

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Q 4MCQ1 Mark
Conc. H2SO4 can be distinguished from dil. H2SO4 by heating each acid with copper turnings :
  • ✓
    SO2 is formed in case of conc. H2SO4, but no action takes place in case of dil. H2SO4
  • B
    SO2 is formed in case of dil. H2SO4, but no action takes place in case of conc. H2SO4
  • C
    SO2 is formed in case of conc. H2SO4, but H2 gas is formed in case of dil. H2SO4
  • D
    none of these

Answer: A.

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Q 5MCQ1 Mark
When pure HCl gas is prepared by treating common salt and conc. sulphuric acid, the gas is passed through conc. H2SO4. In such a situation, the conc. sulphuric acid acts as :
  • A
    dehydrating agent
  • ✓
    drying agent
  • C
    oxidising agent
  • D
    an acid

Answer: B.

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Q 6[2 Mark Question Answer]2 Marks
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 (iv). Some role/s may be repeated.
(a) Dilute acid (b) Dehydrating agent
(c) Non-volatile acid (d) Oxidising agent
(i) $CuSO _4 \cdot 5 H _2 O \xrightarrow{\text { conc. } H _2 SO _4} CuSO _4+5 H _2 O$
(ii) $S + H _2 SO _4$ (conc.) $\rightarrow 3 SO _2+2 H _2 O$
(iii) $NaNO _3+ H _2 SO _4$ (conc.) $\xrightarrow{<200^{\circ} C } NaHSO _4+ HCl$
(iv) $MgO + H _2 SO _4 \rightarrow MgSO _4+ H _2 O$
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Q 7[2 Mark Question Answer]2 Marks
(a) Concentrated sulphuric acid should be kept in air-tight bottles. Why?
(b) Write a balanced equation for the preparation of sulphur dioxide by the action of hot conc. sulphuric acid on sulphur.
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Q 8[2 Mark Question Answer]2 Marks
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 the catalyst required for the above reaction to take place.
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Q 11[3 Mark Question Answer]3 Marks
Explain the following :
(a) Why are the wooden shelves on which concentrated sulphuric acid bottles kept, stained black?
(b) Why is concentrated sulphuric acid always added to water and not water to concentrated sulphuric acid? Why does the mixture get hot?
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Q 12[3 Mark Question Answer]3 Marks
(a) Why is sulphur trioxide formed in this process not absorbed directly in water?
(b) Why is vanadium pentoxide considered a better catalyst than platinised asbestos?
(c) Why is heating of the catalyst discontinued the moment when oxidation of sulphur dioxide takes place?
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Q 14[3 Mark Question Answer]3 Marks
Write balanced chemical 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.
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Q 22Fill in the blanks.1 Mark
When lead acetate solution is added in dilute sulphuric acid the precipitate formed is ________ [yellow/white] in colour and ________ in all acids. [soluble/insoluble]
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Q 27[4 MARCK QUESTION]4 Marks
Some properties of sulphuric acid are listed below. Choose the property A, B, C, or D which is responsible for the reactions (a) to (d). Some properties may be repeated.
A: Acid B: Dehydrating agent C: Non-volatile acid D: Oxidizing agent
(i) $C _{12} H _{22} O _{11}+ nH _2 SO _4 \longrightarrow 12 C +11 H _2 O + nH _2 SO _4$
(ii) $S +2 H _2 SO _4 \longrightarrow 3 SO _2+2 H _2 O$
(iii) $NaCl + H _2 SO _4 \longrightarrow NaHSO _4+ HCl$
(iv) $CuO + H _2 SO _4 \longrightarrow CuSO _4+ H _2 O$
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Q 28[4 MARCK QUESTION]4 Marks
(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.
(b) (i) What is contact process employed for?
(ii) Name two gases which combine during the contact process and the catalyst used in the contact process.
(iii) Write an equation between zinc and final product of the contact process.
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Q 29Match The Following.4 Marks
Identify the property of sulphuric acid for the given reactions.
Column AColumn B
(a) Release of hydrogen gas on reacting with metals.1. Non-volatile acid
(b) Reaction with charcoal to form CO2 gas.2. Dehydrating agent
(c) Release of steamy fumes on reacting with blue vitriol.3. Acidic nature
(d) Forming HCl on reaction with metal chlorides4. Oxidising agent
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