Analytical ChemistryHard
Question
Which one among the following pairs of ions cannot be separated by H2S in dilute hydrochloric acid ?
Options
A.Bi3+, Sn4+
B.Al3+, Hg2+
C.Zn2+, Cu2+
D.Ni2+, Cu2+
Solution
Both belong to same group i.e. IInd group and their KSP values are low ; so both are precipitated according to the following reactions.
2Bi3+ + 3S2- → Bi2S3↓ (black).
Sn4+ + 2S2- → SnS2 ↓ (yellow).
2Bi3+ + 3S2- → Bi2S3↓ (black).
Sn4+ + 2S2- → SnS2 ↓ (yellow).
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