JEE Main · 2020 · 08 Jan 2020 · Shift 1 · States of Matter

A graph of vapour pressure and temperature for three different liquids

X, Y

, and Z is shown below:

The following inferences are made :
(a) X has higher intermolecular interactions compared to Y .
(b) X has lower intermolecular interactions compared to Y .
(c) Z has lower intermolecular interactions compared to Y .

The correct inference ( s ) is / are :

(A)(c)
(B)(a) and (c)
(C)(b)✓ Correct
(D)(a)

Answer: (C)

Solution

At a fixed temperature a liquid with the higher vapour pressure holds its molecules less tightly, since they escape into the vapour more readily. The graph places

X

above

Y

in vapour pressure at every temperature, so

X

has the weaker intermolecular interactions. The sound inference is therefore that

X

has lower intermolecular interactions than

Y

JEE Main · 2020 · 08 Jan 2020 · Shift 1 · Single correct option

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