Question

Name the by-product obtained in the chlor alkali process.

Answer 1

1. Chlor-Alkali product is used for the preparation of sodium hydroxide ($\mathrm{NaOH}$) from common salt ($\mathrm{NaCl}$).
2. Chemical equation can be written as:

$$\begin{gathered} 2\mathrm{NaCl}\left(\mathrm{aq}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\stackrel{\mathrm{electrolysis}}{\to }2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Sodium}\mathrm{Water}\mathrm{Sodium}\mathrm{Chlorine}\mathrm{Hydrogen} \\ \mathrm{Chloride}\mathrm{hydroxide} \end{gathered}$$

3. Hence, We can get chlorine gas (${\mathrm{Cl}}_2$) and hydrogen (${\mathrm{H}}_2$) gas as a by-product.