Question

$H_2\left(g\right)+{Cl}_2\left(g\right)\to 2HCl\left(g\right)$
The above reaction is classified as a ____________ reaction.

• A. decomposition
• B. double displacement
• C. neutralization
• D. oxidation-reduction
• E. single displacement

Answer 1

The correct option is D oxidation-reduction

Option $D$ is the correct answer.

It is an oxidation-reduction reaction. In the left side, the oxidation number of $H_2$ and ${Cl}_2$ both are $0$, since they are in the elemental state. And on the right side, the oxidation number of Hydrogen is $+2$ and that of Chlorine is $-2$ (since 2 moles of $HCl$ are present)

thus here, hydrogen is oxidised by two electron units. And chlorine is reduced by two electron units.

Thus, it is an oxidation-reduction reaction.