[2 Mark Question Answer]

Question 12 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) $MgO + H _2 SO _4 \rightarrow MgSO _4+ H _2 O$

Answer

(a) Dilute acid - (iv), (b) Dehydrating agent - (i),
(c) Non-volatile acid - (iii), (d) Oxidising agent - (ii)

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Question 22 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.

Answer

(a) Conc. sulphuric acid is highly hygroscopic in nature. Thus, it absorbs large amount of moisture from air and changes to dilute form. Thus, it must be kept in air-tight bottles.
(b) $S +2 H _2 SO _4$ (conc.) $\xrightarrow{\text { heat }} 3 SO _2(g)+2 H _2 O$

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Question 32 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.

Answer

(i) The mixture of SO₂ and O₂ should be in the ratio of 2: 1 by volume and free from all impurities.
(ii) A catalyst should be used. Platinised asbestos or vanadium pentoxide is the catalyst at 450 °C.

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Question 42 Marks

Mention the property of conc. H₂SO₄ exhibited in each of the following reactions with:
(i) sugar (ii) metallic chloride

Answer

(i) Dehydration of organic compound
(ii) As a non-volatile acid

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Question 52 Marks

Give one equation each to show the following properties of sulphuric acid :
(i) Dehydrating property
(ii) Acidic nature

Answer

(i) $
C_6 H_{12} O_6+6 H_2 SO_4 \text { (conc.) } \longrightarrow 6 C+6 H_2 SO_4 \cdot H_2 O .
$
Glucose
(ii) 2NaOH + H₂SO₄ (dil.)→ Na₂SO₄ + 2H₂O.

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Question 62 Marks

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 (iv) :
A. Dilute acid (typical acid properties), B. Non-volatile acid, C. Oxidising agent, D. Dehydrating agent
(i) Preparation of hydrogen chloride.
(ii) Preparation of ethene from ethanol
(iii) Preparation of copper sulphate from copper oxide.
(iv) Action of conc. sulphuric acid on sulphur

Answer

(i) B - Non-volatile acid
(ii) D - Dehydrating agent
(iii) A - Dilute acid (typical acid properties)
(iv) C - Oxidizing agent

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