Q.

The correct option for free expansion of an ideal gas under adiabatic condition is :

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a

q=0, ΔT<0 and w>0

b

q=0, ΔT=0 and w=0

c

q<0, ΔT=0 and w=0

d

q>0, ΔT>0 and w>0

answer is A.

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Detailed Solution

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Expansion against zero external pressure is called free expansion.
pext =0;W=pΔV
Process for which dQ = 0 is adiabatic process.
Q = 0
From first Law of thermodynamics,
ΔE=Q+W=0ΔE=nCvΔT=0
Therefore, q = 0, W = 0, T = 0.

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The correct option for free expansion of an ideal gas under adiabatic condition is :