Qualitative Analysis - Result Question 6
####6. Passing $H _2 S$ gas into a mixture of $Mn^{2+}, Ni^{2+}, Cu^{2+}$ and $Hg^{2+}$ ions in an acidified aqueous solution precipitates
(a) $CuS$ and $HgS$
(b) $MnS$ and $CuS$
(c) $MnS$ and $NiS$
(d) $NiS$ and $HgS$
(2011)
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Solution:
- In acidic medium, $H _2 S$ is very feebly ionised giving very small concentration of sulphide ion for precipitation. Therefore, the most insoluble salts $CuS$ and $HgS$ are precipitated only.
