Given below are two statements : Statement I : When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0^\circ . Statement II : The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well. In the light of the above statement, choose the correct answer from the options given below.

Statement I is false but Statement II is true

Statement I is true and Statement II is false

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Properties of Matter PYQ — JEE Main 2024 · 5 Apr · Shift 1 · Q74 with Solution

View written solutionFree

Correct answer: B

For a liquid in a capillary tube,

$h=\frac{2T\cos\theta}{\rho g r}$

where:

If the liquid neither rises nor falls, then

$h=0$

So we must have

$\cos\theta=0 \quad \Rightarrow \quad \theta=90^\circ$

(not $0^\circ$ ).

Therefore, Statement I is false.

The contact angle depends on the nature of:

Hence it is indeed a property associated with the material of the solid and liquid.

Therefore, Statement II is true.

So the correct option is:

$\boxed{\text{B}}$

Stored correct answer: B

My derived answer: B

They agree.