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In the systematic qualitative analysis of cations using group reagents, cations of which groups are precipitated in the form of sulfides?

1. Group II and III
2. Group II and IV
3. Group II and V
4. Group VI and III

Correct answer: Group II and IV

Solution

In qualitative analysis, Group II cations (Cu2+, Pb2+, Bi3+, etc.) are precipitated as sulfides by passing H2S in dilute HCl medium. Group IV cations (Co2+, Ni2+, Zn2+, Mn2+) are precipitated as sulfides by ammonium sulfide ((NH4)2S) in ammoniacal medium.

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