JEE Main · ChemistryEasy

$Which gas is evolved when concentrated H_{2} SO_{4} reacts with NaCl ?$

A. $Cl_{2}$
B. $HCl$
C. $SO_{2}$
D. $O_{2}$

Show correct answer & step-by-step solution

Correct answer: B — $HCl$

Solution

$The reaction is NaCl + H_{2} SO_{4} \to NaHSO_{4} + HCl .$
$Concentrated sulfuric acid acts as a non-volatile acid displacing the volatile HCl gas.$
$The gas evolved is hydrogen chloride.$
$Hence the answer is (B).$

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