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JEE Advanced levelSingle correct optionDifficulty 3 of 3rg044

Two different gases are at the same reduced temperature and the same reduced pressure . According to the law of corresponding states, which quantity must be the same for both?

  1. ATheir molar volumes
  2. BTheir densities
  3. CTheir compressibility factors
  4. DTheir van der Waals constants

Answer: C

The reduced van der Waals equation contains no gas-specific constants, so gases at the same reduced and have the same reduced volume and therefore the same . Actual molar volumes and densities differ because and differ.
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