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JEE Advanced2011Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. ACuS and HgS
  2. BMnS and CuS
  3. CMnS and NiS
  4. DNiS and HgS

Correct answer

A. CuS and HgS

Step-by-step solution

In acidic medium, H ₂ ~S is very feebly ionized giving very small concentration of sulphide ion for precipitation. Therefore, the most insoluble salts CuS and HgS are precipitated only.

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