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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+2H2O+O2(air)4[Au(CN)2]+4OH.
Where, Au(s)O2Au+(aq.) and Au++2CN(aq.)[Au(CN)2] soluble complex formed, so both Assertion and Reason are correct.

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