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Consider the van der Waals constants, a and b, for the following gases. Gas Ar Ne Kr Xe a/(atm dm 6 mol –2 ) 1.3 0.2 5.1 4.1 b/(10 –2 dm 3 mol –1 ) 3.2 1.7 1.0 5.0 Which gas is expected to have the highest critical temperature?

1. Xe
2. Ne
3. Kr
4. Ar

Correct answer: Kr

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