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1. For a given gas Vander Waal’s constant of attraction ‘a’ is always greater than Vander Waals constant of volume (b).
2. The gas having higher value of ‘a’ can be liquefied easily and therefore H2& He are not liquefied easily.
3. The units of a = litre2atm mole–2& that of b = litre mole–1
4. The numerical values of a & b are in the order of 10–1to 10–2& 10–2to 10–4respectively.
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