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NEET2019ChemistryStates of MatterActual

A gas at 350   K and 15 bar has a molar volume 20 per cent smaller than that for an ideal gas under the same conditions. The correct option about the gas, and its compressibility factor Z is

Options

  1. AZ > 1 and repulsive forces are dominant.
  2. BZ > 1 and attractive forces are dominant.
  3. CZ < 1 and attractive forces are dominant.
  4. DZ < 1 and repulsive forces are dominant.

Correct answer

C. Z < 1 and attractive forces are dominant.

Step-by-step solution

Z = P V n R T as V is 20 % lesser than it would have been for an ideal gas. ∴ P V will be lesser than expected. ∴ Z < 1 Since the volume is lesser, the attractive forces are dominant.

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