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Question

In the precipitation of sulphides of second group of basic radiacals, H2S passed into the acidified solution with dilute HCl. If the solution is not acidified, then which is the correct statement ?


  1. Sulphides of both the groups get precipitated

  2. Only the sulphides of second group get precipitated

  3. Only the sulphides of fourth get precipitated

  4. Neither of the sulphides of second and fourth groups get precipitated


Solution

The correct option is A

Sulphides of both the groups get precipitated


In the absence of dilute HCl, ionization of H2S is not suppressed due to common ion effect. As a result, [S2] increases to such an extent that fourth group sulphides having higher KSP values also get precipitated.

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