Question:
Which among the following is correct for electrolysis of brine solution ?
Which among the following is correct for electrolysis of brine solution ?
Updated On: Mar 28, 2026
- $O_2$ gas is liberated at cathode
- Sodium metal is collected at anode
- $H_2$ gas is liberated at cathode
- $Cl_2$ gas is liberated at cathode
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The Correct Option is C
Solution and Explanation
In electrolysis of brine solution, $H _{2}$ gas is liberated at cathode. The solution contains four ions $Na ^{+}, Cl ^{?}, H ^{+}$ and $\overset{?}{O} H$ ions. There occurs a race amongst them for their discharge at their respective electrodes.
Following electrode reactions are possible:
Cathode $2 H _{2} O (l)+2 e^{-} \longrightarrow H _{2}(g)+2 \overset{-}{{O}} H (aq)$
Anode $2 Cr ( aq ) \longrightarrow Cl _{2}( g )+2 e^{-}$
In this electrolysis, $H _{2}$ at cathode and $Cl _{2}$ at anode are given off.
Following electrode reactions are possible:
Cathode $2 H _{2} O (l)+2 e^{-} \longrightarrow H _{2}(g)+2 \overset{-}{{O}} H (aq)$
Anode $2 Cr ( aq ) \longrightarrow Cl _{2}( g )+2 e^{-}$
In this electrolysis, $H _{2}$ at cathode and $Cl _{2}$ at anode are given off.
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Concepts Used:
Electrolysis
Electrolysis:
Electrolysis is the process by which an element is decomposed and undergoes some chemical change under the influence of any electric current. The first-ever electrolysis was executed out by Sir Humphrey Davey in the year 1808. Electrolysis can occur in both Galvanic cells and Electrolytic cells.
Applications of Electrolysis:
- Electrolytic cells are used for the production of Hydrogen and Oxygen gas from water.
- They are used for the large-scale production of pure metals like sodium, copper, magnesium, etc.
- They are used to extract Aluminium from Bauxite.
- Electrolytic cells are used for electroplating, a process by which a thin protective layer of one metal is formed over another metal, mostly for protection.
- Electrolysis is used for the electrorefining of non-ferrous metals.
Read More: Products of Electrolysis