Question

A light greenish coloured salt was soluble in water. On passing `H_2 S` into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present is
A. `Co^(2+)`
B. `Fe^(2+)`
C. `Ni^(2+)`
D. `Mn^(2+)`

Answer 1

`Fe^(2+)+H_(2)S to underset("Black ppt.")(FeS darr) +2H^(+)`
`FeS(s)+2HCl(aq) to FeCl_(2)(aq)+H_(2)S(g)`