Question

In chlor-alkali process, and are released at cathode and anode respectively.

• A. $O_2$
• B. $H_2$
• C. $\mathrm{NaCl}$
• D. ${\mathrm{Cl}}_2$

Answer 1

Answer: (B), (D)

${\mathrm{Cl}}_2$

When electricity is passed through an aqueous solution of sodium chloride (called brine), it results in formation of sodium hydroxide solution. This process is called chlor-alkali process.
The reaction involved is:
$2NaCl\left(aq\right)+2H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+C{l}_2\left(g\right)+H_2\left(g\right)$
Chlorine gas is given out at the anode, and hydrogen gas at the cathode. Sodium hydroxide solution is formed near the cathode.