Question

In which of the following reactions, H₂SO₄ acts as an acid as
well as an oxidant?
(a) C₁₂H₂₂O₁₁□(→┴H₂SO₄) 12C + 11H₂O
(b) S + 2H₂SO₄ → 3SO₂ + 2H₂O
(c) Cu + 2₂SO₄ → CuSO₄ + SO₂ + 2H₂O
(d) NaHCO₃ + H₂SO₄ → NaHSO₄ + H₂O+ CO₂

Answer 1

answer- b

Explanation:

.....................

Answer 2

H₂SO₄ acts as an acid as  well as an oxidant in

(c) Cu + 2₂SO₄ → CuSO₄ + SO₂ + 2H₂O\

An acid is a substance which has a replacable H atom in it.

In H₂SO₄, if the metal Cu reacts with it, 2 atoms of H are replaced by Cu to form CuSO₄.

The reaction Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O is a reaction where H₂SO₄ acts as an acid.

Here, the oxidation no.of Cu increases from 0 (in Cu) to +2 in CuSO₄.

So, H₂SO₄ acts as an oxidant here as well.

So, option (c) is correct.