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Q.

Heat is supplied to a diatomic gas at constant pressure. The ratio of ΔQ:ΔU:ΔW is

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a

5:3:2

b

5:2:3

c

7:5:2

d

7:2:5

answer is C.

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Detailed Solution

γ=7/5;ΔQ:ΔU:Δω=?(1)
LetCP=1/n(dQ)P/dT; (dQ)P=CPndT
(ΔQ)P=CPnΔT(2)CV=1n(dQ)VdT(dQ)P=CPndT here (dQ)V=dU(ΔQ)V=ΔU(ΔQ)V=CVnΔT;ΔU=CVnΔT(3)ΔW=PΔV=nRΔT(4) substitute 2,3,4 in 1ΔQ:ΔU:ΔW=CPndT:CVndT:nRΔTΔQ:ΔU:ΔW=CP:CV:R=γ1:Rγ1:R=7/57/51:17/51:1=7/52/5:1/2/5:1=7/5:5/2:1=7/2:5/2:1=7:5:2=7/2:5/2:1=7:5:2ΔQ:ΔU:Ω=7:5:2

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