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Q.

An ideal gas has pressure P at absolute temperature T. Its pressure is increased by ΔP due to an increase in temperature ΔT. If the volume of the gas remains constant, the fractional change in pressure per unit rise in temperature (ΔP/P)/ΔT is proportional to 

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a

T

b

T

c

1/T

d

1/T

answer is C.

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Detailed Solution

As the gas is ideal: PV = nTR , and here V, n and R are constants. Hence if T changes, P changes. Introducing changes we get V(P+ΔP) = n(T+ΔT)R. From this subtract PV = nTR  and manipulate for the quantity (ΔP/P)/ΔT

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