KMnO₄ is a strong oxidising agent in acid medium. To provide acid medium H₂SO₄ is used instead of HCl. This is because
(a) H₂SO₄ is a stronger acid than HCI.
(b) HCl is oxidised by KMnO₄ to Cl₂
(c) H₂SO4is a dibasic acid
(d) rate is faster in the presence of H₂SO₄