Which of the following statements are incorrect :

Molar volume of every gas at STP is 22.4 L

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Under critical states compressibility factor is 1

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All gases will have equal value of average KE at a given temperature

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At absolute zero, KE is 3/2 R

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Solution

The correct options are
B Under critical states compressibility factor is 1
C At absolute zero, KE is 3/2 R
Molar Volume is the volume occupied by one mole of any gas at STP and 1 mole of any gas at STP occupies 22.4 liters of volume.

Average molecular kinetic energy is zero at a temperature of absolute zero.

The average kinetic energy of a gas particle is directly proportional to the temperature. An increase in temperature increases the speed in which the gas molecules move. All gases at a given temperature have the same average kinetic energy.

Under critical states compressibility factor is 3/8.

Critical constants for a Vander Waals gas are
$V_{C} = 3 b, P_{C} = \frac{a}{27 b^{2}}$ and $T_{C} = \frac{8 a}{27 R b}$

so $Z_{c} = \frac{P_{c} V_{c}}{R T_{c}} = \frac{3}{8} = 0.375$

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