A first row transition metal (M) does not liberate gas from dilute . 1 mol of aqueous solution of is treated with excess of aqueous and then is passed through the solution. The amount of (metal sulphide) formed from the above reaction is _______ mol.

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Solution

Q.
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 $H_{2} S (g)$ is passed through the solution. The amount of $MS$ (metal sulphide) formed from the above reaction is _______ mol. [2026]

1 0

2 1

3 2

4 3

Ans.
(1)

$Cu \overset{dil. HCl}{\to} no reaction$

${CuSO}_{4} \overset{KCN}{\to} \underset{perfect complex}{{[Cu {(CN)}_{4}]}^{3 -}} \overset{H_{2} S}{\to} no sulphide ppt$

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