d and f-Block ElementsHard

Question

A first row transition metal (M) does not liberate $H_{2}$ gas from dilute HCl .1 mol of aqueous solution of ${MSO}_{4}$ is treated with excess of aqueous KCN and then $H_{2}\text{ }S(\text{ }g)$ is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is $\_\_\_\_$ mol.

Options

A.2
B.1
C.3
D.0

Solution

$Cu\overset{\phantom{\text{~}\text{dil.}\text{~}HCl\ }}{\rightarrow}$ no reaction

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