Question

Identify the substances which are oxidized and the substances that are reduced in the following reactions:H2 (g) + Cl2 (g) ⎯⎯→ 2HCl (g)H2 (g) + CuO (s) ⎯⎯→ Cu (s) + H2O (l)Zn (s) + 2AgNO3 (aq) ⎯⎯→ Zn(NO3)2 (aq) + 2Ag (s)

Answer 1

compare whether electrons are added or deleted. if added it is reduction and if not oxidation.

Answer 2

The process of addition of oxygen is oxidation and removal is reduction. Sometimes, hydrogen is added for reduction reaction.

$\bold{H_2 (g) + Cl_2 (g) \longrightarrow 2HCl (g)}$

In the above reaction, the chlorine is reduced.

There is no oxidation process in this reaction.

$\bold{H2 (g) + CuO (s) \longrightarrow Cu (s) + H2O (l)}$

In the above reaction, the hydrogen is oxidized and the copper is reduced.

$\bold{Zn (s) + 2AgNO_3 (aq) \longrightarrow Zn(NO_3)_2 (aq) + 2Ag (s)}$

In the above reaction, the zinc metal is oxidized and the silver metal is reduced.