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Q.

To the salt solution containing II^nd group cation, addition of $H_{2} S$ gas in dil. HCl gives black ppt. To the original solution of salt addition of $K_{4} [F e {(C N)}_{6}]$ solution gives chocolate brown coloured ppt. The cation is ?

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a

$C o^{+ 2}$

b

$C u^{+ 2}$

c

$Z n^{+ 2}$

d

$N i^{+ 2}$

answer is A.

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Detailed Solution

$C u^{+ 2}, I I^{n d}$ group cation

$N i^{+ 2}, Z n^{+ 2}, C o^{+ 2}, I V^{t h}$ group cation

$C u^{+ 2} + H C l + H_{2} S \to C u S (B l a c k p p t)$

$2 C u^{+ 2} + K_{4} [F e {(C N)}_{6}] \to C u_{2} [F e {(C N)}_{6}] + 4 K^{+}$ Chocolate brown ppt

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To the salt solution containing IInd group cation, addition of H2S gas in dil. HCl gives black ppt. To the original solution of salt addition of K4FeCN6 solution gives chocolate brown coloured ppt. The cation is ?