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Q.

For all gases, Cp - Cv = R. This ,R is the

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a

change in potential energy when gas is allowed to fall

b

change kinetic energy when temperature of 1 mole of a gas is increased by 1°C

c

mechanical work when the temperature of L mole of a gas is increased by 1°C

d

None of the above

answer is B.

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Detailed Solution

Mechanical work =pΔV
For one mole of a gas at temperature T
pV=RT
At constant pressure, when temperature is
increased by 1° volume increases (say by ∆V), then 
p(V+ΔV)=R(T+1)∴pV+pΔV=RT+R∴pΔV=R

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