Qualitative Analysis - Result Question 32
####33. Statement I A very dilute acidic solution of $Cd^{2+}$ and $Ni^{2+}$ gives yellow precipitate of $CdS$ on passing $H _2 S$.
Statement II Solubility product of CdS is more than that of NiS.
(1989, 2M)
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Answer:
Correct Answer: 33. (c)
Solution:
- Cation $Cd^{2+}$ belongs to group II while $Ni^{2+}$ belongs to group III of analytical group. Group II radicals are precipitated by passing $H _2 S(g)$ through acidic solution of salt but radicals of group III are precipitated by passing $H _2 S(g)$ in $NH _3 / NH _4 Cl$ buffer solution of salt due to greater solubility products of later salts.
