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NEET levelSingle correct optionDifficulty 1 of 3qa129

Solid sodium chloride is warmed with concentrated sulphuric acid. The gas that gives dense white fumes with a glass rod dipped in aqueous ammonia is:

A $H X_{2} S$
B $Cl X_{2}$
C $HCl$
D $SO X_{2}$

Answer: C

NaCl + H X_{2} SO X_{4} NaHSO X_{4} + HCl

. Hydrogen chloride meets ammonia vapour to give white

NH X_{4} Cl

fumes. Chloride is not oxidised by conc.

H X_{2} SO X_{4}

, so no

Cl X_{2}

forms.

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