WBJEE 2015 Chemistry Solved Paper

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Extraction of gold (Au) involves the fomation of complex ions ‘X’ and ‘Y’.

‘X’ and ‘Y’ are respectivley

Au(CN)2−1 and Zn(CN)4−2
Au(CN)43− and Zn(CN)42−
Au(CN)3−1 and Zn(CN)64−
Au(CN)4− and Zn(CN)3−

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