Arrange the following gases in increasing order of van der Waals constant 'a' A. Ar B. $\mathrm{CH}_{4}$ C. $\mathrm{H}_{2} \mathrm{O}$ D. $\mathrm{C}_{6} \mathrm{H}_{6}$ Choose the correct option from the following :-

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · States of Matter

Arrange the following gases in increasing order of van der Waals constant 'a'
A. Ar
B.

CH_{4}

H_{2} O

C_{6} H_{6}

Choose the correct option from the following :-

(A)B, C, D and A
(B)C, D, B and A
(C)A, B, C and D✓ Correct
(D)D, C, B and A

Answer: (C)

Solution

The van der Waals constant

a

measures the strength of intermolecular attraction and grows with molecular size and polarisability. Argon is a small monatomic gas with the weakest attraction, methane is a little larger, water has extra attraction from hydrogen bonding, and benzene, being the largest with a large polarisable electron cloud, has the greatest value. The increasing order of

a

is argon, then methane, then water, then benzene.

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Single correct option

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