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Question

Select the correct statements about van der Waals' constant b
1. It is excluded volume ​
2. ​​​​​​Its unit is mol L1
3. It depends on intermolecular force
4. ​​​​​​​Its value depends on molecular size

A
2,3
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B
1,4
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C
2,3,4
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D
3,4
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Solution

The correct option is B 1,4
(P+an2V2)(Vnb)=nRT
Since volume of gas molecule is significant for real gases so the nb term is the correction in volume here for real gases. Free volume for n moles of gas is (Vnb) where nb is the excluded volume for n moles of gas because of its significant molecular size. So excluded volume for one mole of gas is b.
From the above equation unit of b=L mol1.
'b' is the measure of effective size of gas molecule.
Hence, the correct answer is option (b).

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