Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Silicones are water-repelling in nature.
Reason (R):	Silicones are organosilicon polymers, which have ( - R 2 SiO - ) as repeating units.

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: Silicones being surrounded by non-polar alkyl groups are water-repelling in nature

Silicones are a group of organosilicon polymers that have

(R_{2} SiO)

as a repeating unit. This suggests that silicones are

surrounded by non-polar alkyl groups that are water-repelling in nature. They have wide applications. It is used for

waterproofing of fabrics.

Hence, both Assertion and Reason are true and the Reason is not the correct explanation of Assertion.