Question

Chlorine, used for manufacturing bleaching powder, is obtained by

• A. Electrolysis of Brine
• B. Reaction of air on dry slaked lime
• C. Reaction of $NaCl$ with moist air
• D. Decomposition of Calcium Hydroxide

Answer 1

The correct option is A Electrolysis of Brine

When electricity is passed through an aqueous solution of sodium

chloride (called brine), it decomposes to form sodium hydroxide. The

process is called the 'chlor-alkali' process because of the products formed– 'chlor' for chlorine and 'alkali' for sodium hydroxide.
The reaction involved in the process is:

$2NaCl\left(aq\right)+2H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+C{l}_2\left(g\right)+H_2\left(g\right)$

Thus, Option $A$ is correct.