6) Which liquid has the weakest surface tension? a. Methanol (CH3OH) b. Helium (

Question

6) Which liquid has the weakest surface tension?

a. Methanol (CH3OH)

b. Helium (He)

c. Butane (C4H10)

d. Ethylene glycol (HOCH2CH2OH)

7) Why is warm honey easier to pour than cold honey?

a. Increasing the temperature breaks the molecules down into atoms, which are smaller.

b. Increasing the temperature increases the kinetic energy of the molecules, which makes it easier to overcome the attractive forces between molecules.

c. Increasing the temperature converts the sugars into water, which flows easier.

d. Increasing the temperature makes the honey more viscous.

8) Which is NOT an example of capillary action?

a. A mop cleans up a spill on the floor.

b. A towel dries your hands after washing them.

c. Flowers consume water after being cut.

d. A paperclip floats on water.

Explanation / Answer

Ans 6 : B) Helium (He)

The surface tension of the substances depends on their intermolecular forces. Stronger the intermolecular forces , higher will be the surface tension.

Since helium is a monoatomic noble gas , there are no such predominant intermolcular forces acting on its particles , so its surface tension will be the weakest amongst all others.

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