A light greenish coloured salt was soluble in | vedclass

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(B) The salt is light green,which is characteristic of $Fe^{2+}$ ions in aqueous solution. When $H_2S$ is passed through a solution containing $Fe^{2+

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$Fe^{2+}$

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(B) The salt is light green,which is characteristic of $Fe^{2+}$ ions in aqueous solution. When $H_2S$ is passed through a solution containing $Fe^{2+}$ ions (usually in the presence of a buffer or under specific conditions),it forms $FeS$,which is a black precipitate. $FeS$ is a metal sulfide that is readily soluble in dilute $HCl$ because the reaction $FeS + 2HCl \rightarrow FeCl_2 + H_2S$ occurs,shifting the equilibrium. Therefore,the metal ion present is $Fe^{2+}$.

$A$ light greenish coloured salt was soluble in water. On passing $H_2S$ into the solution,a black precipitate was obtained which dissolved readily in $HCl$. The metal ion present is:

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