Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.
Reason (R):	The colored components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Chromatography

In paper chromatography, a chromatography paper is used. It contains water, which acts as the stationary phase. A strip of

chromatography paper spotted at the base with ink is suspended in a suitable solvent. The solvent acts as the mobile phase.

The solvent rises up the paper by capillary action and flows over the spot. The paper selectively retains different components

according to their differing partition in two phases.

Hence, components of ink will migrate at different rates and are separated. Thus, both assertion and reason are true and the

the reason is the correct explanation of assertion.