Assertion , Silver ores and native gold have to be leached with metal cyanides.
Reason : Silver and gold do not form complex ion with cyanide ion.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of(A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

C

Explanation

Silver and gold form complex ion with cyanide ions such complex ions are soluble in water. Thus, the gold and silver portion (which is generally in small amounts), of the ore can be brought into the solution thereby removing all the undesirable material.