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Q.

Assertion : Gold is recovered from its solution containing aurocyanide complex by adding zinc dust

Reason : Zinc is more electropositive than gold.

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a

If both assertion and reason are true and the reason is the correct explanation of the assertion.

b

If both assertion and reason are true but reason is not the correct explanation of the assertion.

c

If assertion is true but reason is false.

d

If the assertion and reason both are false.

answer is A.

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Detailed Solution

Au is recovered from the solution by the addition of electropositive metal.

2NaAu(Cu)2+ZnNa2Zn(CN)4 Soluble complex +2Au

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Assertion : Gold is recovered from its solution containing aurocyanide complex by adding zinc dustReason : Zinc is more electropositive than gold.