Qualitative Analysis - Result Question 32
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Statement I is correct Statement II is correct Statement II is a correct; explanation of Statement I
(b) Statement I is correct; Statement II is correct Statement II is not the correct explanation of Statement I.
(c) Statement I is correct; Statement II is incorrect.
(d) Statement I is incorrect; Statement II is correct.
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.
BETA
