Adivalent metal ion dissolved in dilute hydrochloric acid forms a precipitate when h2s is bubbled through the solution. which ion is it?

Due to the cation forms a precipitate by adding H₂S in presence of HCl so this cation must be from group II cations 

The choices provided for this question are: Ca²⁺, Mn²⁺, Zn²⁺ and Cd²⁺

So the correct answer will be cadmium since it is the only cation from choices that present in group II cations

If you have other choices you can choose any member of group II cations and divalent like Cu²⁺ , Hg²⁺

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