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Arrange the following gases in increasing order of van der Waals constant ‘a’ (A) Ar (B) CH 4 (C) H 2 O (D) C 6 H 6 Choose the correct option from the following.

1. D, C, B and A
2. B, C, D and A
3. C, D, B and A
4. A, B, C and D

Correct answer: A, B, C and D

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