Question

When aqueous sodium chloride is electrolysed, which are right combination of species obtained at the two electrodes? *
1 point
a) H₂ at cathode and Cl₂ at anode
b) Na at cathode and Cl₂ at anode
c) Na at cathode and O₂ at anode
d) H₂ at cathode and O₂ at anode​

Answer 1

Answer:

(A).H2 at cathode and cl2 at annode

Answer 2

Answer:

When aqueous sodium chloride is electrolyzed then the liberation of H₂ at cathode and O₂ at anode​ takes place i.e.option(d).

Explanation:

During the electrolysis of aqueous sodium chloride following changes takes place at respective electrodes:-

At Cathode

The reduction of hydrogen takes place if preference to sodium ion(Na⁺) as the reduction potential of sodium ion is less than hydrogen.

$2H^++2e\rightarrow H_2(g)$

The evolution of hydrogen gas takes place.

At Anode

Since hydroxide(OH⁻) ion is less stable than chloride(Cl⁻) ions so oxidation of hydroxide takes place in preference to chloride.

$4OH^-(aq)\rightarrow 2H_2O(l)+O_2(g)+4e$

The evolution of oxygen gas(O₂) and water take place.

Hence, the correct answer among the given option is (d) H₂ at the cathode and O₂ at the anode​.

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