1.

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.

Answer»

If both assertion and reason are TRUE and the reason is the CORRECT explanation of the assertion.
if both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.

Solution :Assertion is true but reason is false.
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 IV group cations.


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