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Question

Mention the reaction conditions and give balanced equations to obtain
(i) Cl2 gas from HCl gas.
(ii) Cl2 gas from HCl acid.
(iii) HCl gas from common salt.

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Solution

(i) Decomposition of HCl gas at temperatures above 500o C gives chlorine and hydrogen gas.

2HCl(g) ⇌ H2(g) + Cl2(g)

(ii) When concentrated HCl acid reacts with strong oxidising agents, Cl2 is liberated.

For example,
MnO2 + 4HCl → MnCl2 (aq) + 2H2O + Cl2
Manganese Manganese
dioxide chloride
(black)

(iii) Sodium chloride (common salt) and concentrated sulphuric acid react to produce HCl gas.
The reaction takes place as follows:
NaCl(s) + H2SO4(aq) → NaHSO4(s) + HCl(g)
Sodium chloride Sulphuric acid Sodium hydrogen Hydrogen chloride
sulphate gas


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