$H_{2} O (l) \to H_{2} O (g)$
Correct statements concerning the process above occurring at $100^{o} C$ include which of the following?
$I$ . The vaporization process is endothermic
$I I$ . The randomness of the system increases during vaporization
$I I I$ . The average potential energy of the vapour molecules is greater than that of the liquid molecules.

I

only

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I I I

only

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I

and

I I I

only

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I I

and

I I I

only

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I, I I

and

I I I

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Solution

The correct option is D $I, I I$ and $I I I$
Vaporization process are endothermic because gaseous particles possess more kinetic than those in liquid state and hence we can say absorption of energy takes place

Gas particles has higher kinetic energy than liquid and they have more space available for them to move faster and randomly. Hence randomness of system increases during vaporization

When liquid changes to vapor, it gain some energy. So we can say vapor gains the energy of vaporization. Hence vapor has high potential energy.

So all statements are correct.

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(II)

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Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

(a) i, ii and iv only
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Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

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