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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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Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
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