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Q.

An ideal gas is taken through the process ABC shown in figure. Then

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a

in process AB work done by the gas is positive

b

in process AB heat is rejected

c

in process AB internal energy decreases.

d

in process BC internal energy decreases.

answer is B.

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Detailed Solution

(2)AB is isothermal compression process. So ΔT=0,   ΔU=0, work done by the gas is negative. Therefore from Q=ΔU+W it is clear that Q is negative i.e., heat is rejected. BC is isobaric compression process. As T decreases, internal energy also decreases.
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An ideal gas is taken through the process ABC shown in figure. Then