Question

9701 s16_qp_12.pdf - Adobe Reader

Answer 1

The change in oxidation number = +1

Further explanation

Reaction 1

Cl₂(aq) + H₂O(I) → H⁺(aq) + Cl⁻(aq) + HClO(aq)

Reaction 2

HClO(aq) + H₂O(I) → H₃O⁺(aq) + ClO⁻(aq)

The change in oxidation number of chlorine :

From Cl₂ to ClO⁻

oxidation number Cl₂=0

oxidation number Cl in ClO⁻

$\tt Cl+(-2)=-1\\\\Cl=+1$

So the change : +1