Identify the redox reactions out of the following reactions and identify the oxidising and reducing agents in them. (i) 3HCI(aq) + HNO 3 (aq) → CI 2 (g) + NOCI (g) + 2H 2 O(l) (ii) HgCI 2 (aq) + 2KI (aq) → HgI 2 (s) + 2KCI (aq) (iii) Fe 2 O 3 (s) + 3CO(g) → 2Fe (s) + 3CO 2 (g) (iv) PCI 3 (I) + 3H 2 O (I) → 3HCI (aq) + H 3 Po 3 (aq) (v) 4NH 3 + 3O 2 (g) → 2N 2 (g) + 6H 2 O (g)

Question

Philoid · Accepted Answer

Option (i)

Cl oxidizes from -1 to 0 and Nitrogen reduced from +5 to +3. Thus as Cl oxidizes it acts as reducing agent and nitric acid acts as an oxidizing agent.

Reducing agent: HCl

Oxidizing agent: HNO₃

Option (ii)

This reaction is an example of displacement reaction, and none of the components undergo oxidation or reduction, as the oxidation states oh Hg, Cl, K, & I are same in both reactants and products.

Option (iii)

Oxidising agent: Fe₂O₃

Reducing agent: CO

Option (iv)

Oxidising agent: O₂

Reducing agent: NH₃