Q. 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
Explanation
(a)
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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.