H₂S (g) + Cl₂ (g) → 2 HCl (g) + S (s)

The correct statement(s) in the balanced equation is(are):

a. H₂S is oxidised
b. Cl₂ is reduced
c. H₂S is reduced
d. Cl₂ is oxidised

1. a, b
2. b, c
3. c, d
4. a, d

2Cu₂O(s) + Cu₂S(s) → 6Cu(s) + SO₂(g)

The correct statement among the following regarding above mentioned reaction is-

1. Cu is reduced and Cu(I) is an reductant
2. Sulphur is reduced and S in Cu₂S acts as oxidant
3. Cu(I) is an oxidant and Cu(I) is reduced.
4. Sulphur is reduced and Cu is oxidised

For the reaction:
Fe₃O₄ (s) + Al (s) → Fe (s) + Al₂O₃ (s)
The correct statement(s) in the equation is(are):

1. a, c
2. a, b
3. b, c
4. c, d