If barium sulphate is precipitated in a solution containing potassium permanganate it is coloured pink ( violet) by :

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absorption of some of the permanganate

adsorption of some of the permanganate

both (a) and (b)

none of the above

answer is B.

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Detailed Solution

When barium sulfate (BaSO₄) is precipitated in a solution containing potassium permanganate (KMnO₄), the BaSO₄ appears pink or violet due to the adsorption of permanganate ions onto its surface.

Explanation:

Adsorption refers to the adhesion of ions or molecules onto the surface of a solid.
In this scenario, permanganate ions (MnO₄⁻) from the solution adhere to the surface of the freshly precipitated barium sulfate particles.
The inherent purple color of permanganate ions imparts a pink or violet hue to the BaSO₄ precipitate.

This phenomenon is a classic example of adsorption, where the surface properties of the precipitate lead to the accumulation of colored ions, altering its appearance.

Therefore, the correct answer is: b) adsorption of some of the permanganate

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