(1) 2H2S2(g) + SO2(g) → 3S(s) + 2H2O(I) (2) CuO(s) + H2(g) → CU(s) + H2O(I)

Question

What are redox reactions? Identify the substances that are oxidised and the substances that are reduced in the following reactions:

(1) 2H₂S_2(g) + SO_2(g) → 3S_(s) + 2H₂O_(I)

(2) CuO_(s) + H_2(g) → CU_(s) + H₂O_(I)

Answer 1

When oxidation and reduction take place simultaneously in a given chemical reaction, it is known as a redox reaction.

(1)

H₂S is oxidised and SO₂ is reduced.

(2)

CuO is reduced and H₂ is oxidised.

(3)

(1) Oxidation: H₂S, H₂O and HCl.

(2) Reduction: SO₂, CuO and MnO₂