Assertion (A): Concentrated sulphuric acid is kept in air tight bottles.

Reason (R): Air contains impurities, therefore H₂SO₄ will get spoiled.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Sulphuric acid acts as an oxidising agent.

Reason (R): Sulphuric acid produces hydrogen on reacting with zinc.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

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

Column I
(A) Dilute acid

(B) Dehydrating agent

(C) Non-volatile acid

(D) Oxidising agent

Column II
(a) CuSO₄.5H₂O $\xrightarrow{\text{Conc. H}$2 \text{SO}4} CuSO₄ + 5H₂O

(b) S + 2H₂SO₄ [conc.] ⟶ 3SO₂ + 2H₂O

(c) NaNO₃ + H₂SO₄ [conc.] $\xrightarrow{\lt 200 \degree\text{C}}$ NaHSO₄ + HNO₃

(d) MgO + H₂SO₄ ⟶ MgSO₄ + H₂O

(e) Zn + 2H₂SO₄ [conc.] ⟶ ZnSO₄ + SO₂ + 2H₂O

Fill in the blanks. Choose from the following :
[oleum, two, three, acid, black, white, lead nitrate, ethene, sulphate, barium chloride solution, sulphur dioxide, normal]

(a) Sulphur can be oxidised to …………… by conc. sulphuric acid.

(b) Conc. sulphuric acid convert ethanol to …………… .

(c) Sulphate ion can be tested by …………… or …………… .

(d) Sulphur trioxide reacts with conc. sulphuric acid to form …………… .

(e) The basicity of sulphuric acid is …………… . It can form …………… salt and …………… salt.

(f) Metal sulphate solution gives …………… precipitate with …………… solution.