Question

Assertion :If $HCI$ gas is passed through saturated $NaCl$ solution,solid $NaCl$ starts separating out Reason: $HCI$ decreases the solubility product of $NaCI.$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

When you have a saturated NaCl solution you have the equilibrium:

$NaCl\left(s\right)\to N{a}^{+}\left(aq\right)+C{l}^{-}\left(aq\right)$

This equilibrium obeys LeChatelier's principle,

When you add more $C{l}^{-}$ to the already saturated solution the equilibrium must shift to the left forming more $NaCl$(s). When your solution contains no solid phase and all of the $NaCl$ is present as ions in solution then you are able to produce very pure $NaCl$(s) by bubbling $HCl$(g) into the saturated solution of $NaCl.$