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Question

Assertion :Extraction of gold from its native ore involves leaching the metal ore with dilute solution of NaCN in presence of air. Reason: This is an oxidation reaction and leads to the formation of a soluble complex.


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
In extraction of gold: $$4Au+8CN^-+2H_2O+O_2(air)\rightarrow 4[Au(CN)_2]^-+4OH^-$$.
Where, $$Au(s)\xrightarrow {O_2} Au^+ (aq.)$$ and $$Au^++2CN^-(aq.)\rightarrow [Au(CN)_2]^-$$ soluble complex formed, so both Assertion and Reason are correct.

Chemistry

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