First slide

Solubility product(KSP)

Question

Which of the following is precipitated as sulphide in acidic solutions

Easy

A

Ni²⁺
B

Zn⁺²
C

Cu²⁺
D

Mn⁺²

Solution

Cu⁺² is a group II cation, which is precipitated by adding H₂S(g) in presence of dil HCl as sulphide. HCl is added as a low concentration of S^-2 ion is required to cause the precipitation. Other options belong to group IV cations, which are precipitated by adding H₂S(g) in presence of NH₄OH as for these cations relative higher concentration of S^-2 ions are desired.

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