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Thermodynamics

Section: Chemistry

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Question : 10 of 40

Marks: +1, -0

An ideal gas undergoes a reversible isothermal expansion from state I to state II followed by a reversible adiabatic expansion from state II to state III. The correct plot(s) representing the changes from state I to state III is(are)

p

V

T

H

S

[JEE Adv 2021 P1]

Solution:

(a, b, d) From state I to II (Reversible isothermal expansion)

T \rightarrow

constant,

\Delta V \rightarrow +

ve,

\Delta S \rightarrow +

ve,

\Delta H \rightarrow 0

P \rightarrow -

ve

From state II to III (Reversible adiabatic expansion)

q \rightarrow 0, \Delta V \rightarrow +

ve,

\Delta S \rightarrow

constant

H \rightarrow -

ve,

P \rightarrow -

ve,

T \rightarrow -

ve

\therefore

Plots (a), (b), (d) are correct while (c) is wrong as form state II to III,

H

is decreasing.

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