Question

Assertion : Sb (III) is not precipitated as sulphide when in its alkaline solution H₂S is passed. 

Reason : The concentration of S^2- ion in alkaline medium is inadequate for precipitation.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is (c) A is true but R is false.

Explanation:

Sb (III) is a basic radical of IIB group for which group reagent is H₂S in presence of dilute HCI. 

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.