Question

Which of the following is incorrect regarding chlor-alkali process?

• A. It utilises brine solution
• B. Reaction involved is:
  $2NaCl\left(aq\right)+2H_{2}O\left(l\right)\to 2NaOH\left(aq\right)+C{l}_2\left(g\right)+H_2\left(g\right)$
• C. Hydrogen gas is given out at the anode
• D. Sodium hydroxide solution is formed near the cathode

Answer 1

The correct option is C Hydrogen gas is given out at the anode

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.