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AIIMS2004ChemistryIonic Equilibrium

Assertion : Sb (III) is not precipitated as sulphide when in its alkaline solution H ₂ ~S is passed. Reason : The concentration of S ²⁻ ion in alkaline medium is inadequate for precipitation.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

Sb (III) is a basic radical of IIB group for which group reagent is H ₂ ~S in presence of dilute HCl . It is necessary to maintain the proper hydrogen ion concentration for the precipitation of IInd group cations and to check the precipitation of IV group cations.

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