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JEE Main2015Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The cation that will not be precipitated by H 2 S in the presence of dil HCl is:

Options

  1. AC o 2 +
  2. BA s 3 +
  3. CP b 2 +
  4. DC u 2 +

Correct answer

A. C o 2 +

Step-by-step solution

C o 2 + precipitated by H 2 S in presence of N H 4 O H in group IV as CoS (Black ppt.) Other are precipitated as sulphide in presence of dil HCl in group II.

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