Assertion: $p H$ value of $H C N$ solution decreases when $N a C N$ is added to it
Reason: $N a C N$ provides a common ion $C N^{⊝}$ to $H C N$

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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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is incorrect but Reason is correct
$(A)$ is wrong because the addition of $N a C N$ to $H C N$ , due to common ion $(C N^{⊝})$ , the degree of dissociation of $H C N$ is suppressed and hence less $[H^{\oplus}]$ and increase in $p H .$

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Similar questions

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ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

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Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
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Assertion: pH value of HCN solution decreases when NaCN is added to itReason: NaCN provides a common ion CN⊝ to HCN

The correct option is C Assertion is incorrect but Reason is correct(A) is wrong because the addition of NaCN to HCN, due to common ion (CN⊝), the degree of dissociation of HCN is suppressed and hence less [H⊕] and increase in pH.

Assertion: $p H$ value of $H C N$ solution decreases when $N a C N$ is added to it
Reason: $N a C N$ provides a common ion $C N^{⊝}$ to $H C N$

The correct option is C Assertion is incorrect but Reason is correct
$(A)$ is wrong because the addition of $N a C N$ to $H C N$ , due to common ion $(C N^{⊝})$ , the degree of dissociation of $H C N$ is suppressed and hence less $[H^{\oplus}]$ and increase in $p H .$