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The commercial NaCl salt is purified by passing
Option: 1
$\mathrm{HCl}$ gas through a saturated salt solution

Option: 2
$\mathrm{H}_2 \mathrm{S}$ gas through an alkaline salt solution

Option: 3
$\mathrm{H}_2$ gas through a saturated salt solution

Option: 4
$\mathrm{Cl}_2$ gas through a saturated salt solution

Answers (1)

best_answer

Saturated salt solution is filtered to remove the insoluble impurities. The filtrate is then saturated by passing HCl through it, which gives the pure salt of NaCl by common ion effect. The salts of Ca and Mg remains in the solution due to their higher solubility.

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Gautam harsolia

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