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Raoult's Law

Assertion :If...

Question

Assertion :If $H C l$ gas is passed through saturated $N a C l$ solution, solid $N a C l$ starts separating out. Reason: $H C l$ decreases the solubility product of $N a C l$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
When $H C l$ is passed through saturated $N a C l$ solution then the concentration of $C l^{-}$ increases so equilibrium will move backward results in formation of $N a C l$ means there is decrease in solubility of $N a C l$ so solid $N a C l$ starts separating out.
$H C l$ does not decreases the solubility product of $N a C l$ rathar than it results in decrease in solubility of $N a C l$ .

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