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Q.

Consider one mole of a real gas A, with equation of state P(V b) =RT where ‘b’ is a constant. Which of the following is/are correct statement(s) about A? 
P = pressure, V=volume, T-temperature in Kelvin R = 8.314J Kmol1 

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a

Potential energy of A, due to intermolecular forces, is either greater than (or) equal to that of ideal gas

b

Compressibility factor (Z) of A is directly proportional to ‘P’.

c

If 5J of heat is given to A and 2J work is done by the A then, its internal energy increases by 3J which is true for ideal gas also

d

Density of A is less than ideal gas  P > 0

answer is A, B, C.

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Detailed Solution

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(A) z > 1  didr>1dr<di
(B) Always repulsions z > 1
(C) First law of thermodynamics is valid for real gas (or) ideal gas
(D) ‘z’ linearly varies with p.

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