Question

Define : Oxidation.

Answer 1

• Oxidation : The addition of oxygen to a substance or removal of hydrogen from a substance is known as oxidation.

Example (1). $\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{}{\to }{\mathrm{CO}}_2\left(\mathrm{g}\right)$

In this reaction carbon $\left(\mathrm{C}\right)$ is getting oxidised by addition of oxygen to form carbon dioxide $\left({\mathrm{CO}}_2\right)$.

(2). $4\mathrm{HCl}\left(\mathrm{aq}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{}{\to }2{\mathrm{Cl}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

In this reaction hydrochloric acid $\left(\mathrm{HCl}\right)$ is getting oxidised by removal of hydrogen to form Chlorine $\left({\mathrm{Cl}}_2\right)$ gas.