The angle of contact at the interface of water-glass is 0- - Ethylalcohol-glass is 0- Mercury-glass is 140- and Methyliodide-glass is 30- - A glass capillary is put in a trough containing one of these four liquids- It is observed that the meniscus is convex- The liquid in the trough is

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Standard XII

Biology

Vital Capacity

The angle of ...

Question

The angle of contact at the interface of water-glass is $0^{\circ}$ , Ethylalcohol-glass is $0^{\circ}$ , Mercury-glass is $140^{\circ}$ and Methyliodide-glass is $30^{\circ}$ . A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is

ethylalcohol

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mercury

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methyliodide

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water

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Solution

The correct option is B mercury
The meniscus of liquid in a capillary tube will be convex upwards if the angle of contact is obtuse. It is so when one end of a glass capillary tube is immersed in a trough of mercury.

The reason for meniscus to be convex is due to greater force of cohesion as compared to adhesion force.

Final Answer: (c)

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Similar questions

Q. Mercury has an angle of contact equal to 140° with soda lime glass. A narrow tube of radius 1.00 mm made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside ? Surface tension of mercury at the temperature of the experiment is 0.465 N m¯¹Density of mercury = 13.6 × 103 kg m¯³

Explain why

(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.

(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)

(d) Water with detergent dissolved in it should have small angles of contact.

(e) A drop of liquid under no external forces is always spherical in shape

Q. The angle of contact at the interface of water-glass is

0^{o}

, Ethylalcohol-glass is

0^{o}

, mercury-glass is

140^{o}

and Methyliodide-glass is

30^{o}

. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is then

Q. The angle of contact at the interface of water-glass is

0^{\circ}

. Ethyl alcohol-glass is

0^{\circ}

. Mercury-glass is

140^{\circ}

and Methyl iodide-glass is

30^{\circ}

. A glass capillary is put in trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is:

Q. The angle of contact at the interface of water glass is

0^{\circ}

, Ethyl-alcohol glass is

0^{\circ}

Mercury glass is

140^{\circ}

and Methyl iodide is

30^{\circ}

. A glass capillary is put in a trough containing one of these for liquids it is observed that the meniscus is convex. the liquid in the trough is :

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Vital Capacity

Standard XII Biology

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The angle of contact at the interface of water-glass is 0∘ , Ethylalcohol-glass is 0∘, Mercury-glass is 140∘ and Methyliodide-glass is 30∘ . A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is