Give a balanced equation for – Dilute sulphuric acid is poured over sodium sulphite

Give balanced equations for the manufacture of sulphuric acid by the Contact process.

Name the gas produced on reaction of dilute sulphuric acid with a metallic sulphide.

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.

A : Dilute acid
B : Dehydrating agent
C : Non-volatile acid
D : Oxidising agent

(1) $\text{CuSO}$4.5\text{H}2\text{O} \xrightarrow{\text{Conc. H}2 \text{SO}4} \text{CuSO}4 + 5\text{H}2\text{O}

(2) S + 2H₂SO₄ [conc.] ⟶3SO₂ + 2H₂O

(3) $\text{NaNO}$3 + \text{H}2\text{SO}4 [\text{conc.}]\xrightarrow{\lt 200 \degree\text{C}} \text{NaHSO}\text{4} + \text{HNO}_\bold{3}

(4) MgO + H₂SO₄ ⟶ MgSO₄ + H₂O

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