Qualitative Analysis - Result Question 6

####6. Passing H2S gas into a mixture of Mn2+,Ni2+,Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates

(a) CuS and HgS

(b) MnS and CuS

(c) MnS and NiS

(d) NiS and HgS

(2011)

Show Answer

Answer:

Correct Answer: 6. (a)

Solution:

  1. In acidic medium, H2S is very feebly ionised giving very small concentration of sulphide ion for precipitation. Therefore, the most insoluble salts CuS and HgS are precipitated only.
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