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
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Assertion is incorrect but Reason is correct

Solution

## The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionIn 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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