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JEE Advanced 2011Paper 2
Exam
JEE Advanced
Year
2011
Paper
Paper 2
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Advanced 2011 · Paper 2 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Passing H_2 ~S gas into a mixture of Mn^ 2+ , Ni^ 2+ , Cu^ 2+ and...

Passing H2 S\mathrm{H}_2 \mathrm{~S} gas into a mixture of Mn2+,Ni2+,Cu2+\mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}, \mathrm{Cu}^{2+} and Hg2+\mathrm{Hg}^{2+} ions in an acidified aqueous solution precipitates

Options

  1. ACuS\mathrm{CuS} and HgS\mathrm{HgS}
  2. BMnS\mathrm{MnS} and CuS\mathrm{CuS}
  3. CMnS\mathrm{MnS} and NiS\mathrm{NiS}
  4. DNiS\mathrm{NiS} and HgS\mathrm{HgS}

Correct answer

A. CuS\mathrm{CuS} and HgS\mathrm{HgS}

Step-by-step solution

In acidic medium, H2 S\mathrm{H}_2 \mathrm{~S} is very feebly ionized giving very small concentration of sulphide ion for precipitation. Therefore, the most insoluble salts CuS\mathrm{CuS} and HgS\mathrm{HgS} are precipitated only.
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