Ncert Exercises & Solutions

In which of the following reactions conc. H₂SO₄ is used as an oxidising reagent?

a.	CaF₂ + H₂SO₄ → CaSO₄ + 2 HF
2.	2HI + H₂SO₄ → I₂ + SO₂ + 2H₂O
3.	Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O
4.	$NaCl + H_{2} {SO}_{4} \to {NaHSO}_{4} + HCl$

Choose the correct option:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Oxidising agent oxidized other, and itself gets reduced.

In the above given four reactions, (b) and (c) represent oxidizing behaviour of H₂SO₄ . As we know that oxidizing agent reduces itself as the oxidation state of the central atom decreases. Here,

2 \overset{- 1}{HI} + H_{2} \overset{- 6}{S} O_{4} \to \overset{0}{I_{2}} + \overset{- 4}{{SO}_{2}} + 2 H_{2} O

\overset{0}{Cu} + 2 H_{2} \overset{+ 6}{{SO}_{4}} \to \overset{+ 2}{Cu} {SO}_{4} + \overset{+ 4}{{SO}_{2}} + 2 H_{2} O

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