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Reaction Quotient

Assertion : ...

Question

Assertion : $A g_{2} S + 4 K C N_{2} 2 K [A g (C N)_{2}] + K_{2} S$ Reason: The reaction is carried out in presence of air or O $_{2}$ so that K $_{2}$ S is oxidised to K $_{2}$ SO $_{4}$ thereby shifting the equilibrium in forward direction.

A

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

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B

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

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C

Assertion is correct but Reason is incorrect

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D

Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$A g_{2} S + 4 K C N_{2} 2 K [A g (C N)_{2}] + K_{2} S$
when silver sulfide reacts with potassium cyanide product is a complex form and potassium sulfide
so assertion are right and it is possible to contain presence of oxygen reason is correct explanation

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