Give balanced equations for the preparation of the following salts –

(a) (i) CuSO₄

(ii) NaHSO₄

(iii) Na₂SO₄

(iv) FeSO₄

(v) BaSO₄

(vi) PbSO₄ — using dil. H₂SO₄

(b) (i) NaHSO₄

(ii) CuSO₄ — using conc. H₂SO₄

(a) Using dil. H₂SO₄ :

1. Preparation of CuSO₄:
   CuO + H₂SO₄ ⟶ CuSO₄ + H₂O
2. Preparation of NaHSO₄:
   NaOH + H₂SO₄ ⟶ NaHSO₄ + H₂O
3. Preparation of Na₂SO₄:
   Na₂CO₃ + H₂SO₄ ⟶ Na₂SO₄ + H₂O + CO₂
4. Preparation of FeSO₄:
   Fe + H₂SO₄ ⟶ FeSO₄ + H₂
5. Preparation of BaSO₄:
   BaCl₂ + H₂SO₄ ⟶ BaSO₄ + 2HCl
6. Preparation of PbSO₄:
   Pb(NO₃)₂ + H₂SO₄ ⟶ PbSO₄ + 2HNO₃

(b) Using conc. H₂SO₄ :

1. Preparation of NaHSO₄:

$\text{NaCl} + \text{H}$2\text{SO}4 [\text{conc.}] \xrightarrow{\lt 200 \degree\text{C}}\text{NaHSO}_4 + \text{HCl}

2. Preparation of CuSO₄:
   CuO + H₂SO₄ ⟶ CuSO₄ + H₂O