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Q.

For tap water and clean glass, the angle of contact is:

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a

b

c

14 0^{\circ}

d

answer is D.

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Detailed Solution

Concept: The notion of cohesiveness and adhesiveness for a given liquid and the container's wall, in which the liquid is housed, can be used to address the aforementioned problem. The ion composition of the liquid, the strength of the cohesive force, and the strength of the adhesive force all affect the angle of contact.
As both cohesive and adhesive forces are identical, it is discovered that the angle of contact between pure water and glass is

0^{0}

(or a perfect angle). However, because there are ions in tap water, the angle of contact is sharp from

8^{0}

to

1 8^{0}

degrees.
Hence, the correct option is 4.

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