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4. Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V.

The mass of the gas in A is mB and that in B  is . The gas in each cylinder is now allowed to expand isothermally to the same final volume 2V. The changes in the pressure in A and B are found to be ΔP and 1.5 ΔP  respectively. Then

(a)    4mA = 9mB                    (b) 2mA = 3mB

(c)   3mA = 2mB                          (d) 9mA = 3mB

Ans. c

(11)

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