One mole of a monatomic ideal gas is taken through a cycle ABCDA as shown in $P - V$ diagram. List-II gives the characteristics involved in the cycle. Match them with each of the processes given in List-I.

Question

List - I	List - II
(P) Process A → B	(1) Internal energy decreases.
(Q) Process B → C	(2) Internal energy increases.
(R) Process C → D	(3) Heat is lost.
(S) Process D → A	(4) Heat is gained.
	(5) Work is done on the gas.

TestHub · Accepted Answer

For (A) : In process AB (isobaric compression) Work is negative, $Δ U$ is negative, $Δ Q$ is negative For (B) : BC process (Isochoric) Work is zero, $Δ U$ is negative, $Δ Q$ is negative

For (C) : CD Process (Isobaric expansion) Work is negative, $Δ U$ is positive, $Δ Q$ is positive

For ( D ) : DA Process ( $V =$ decreases Isothermal) Work is negative, $Δ U$ is zero, $Δ Q$ is negative

Chemistry - Thermodynamics - I Question with Solution | TestHub

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JEE Advanced 2027 (Class 12)