JEE Main 2022 — Chemistry Physical Chemistry

2022mcqeasy

Which of the following relation is not correct?

Official previous-year question

Held on 28 Jul 2022 · Verified 6 Jul 2026.

Options

A
$\Delta H=\Delta U-P\Delta V$
B
$\Delta U=q+W$
C
${\Delta S}_{\mathrm{sys}}+{\Delta S}_{\mathrm{surr}}\geq 0$
D
$\Delta G=\Delta H-T\Delta S$

Did you get this right?

Solution

Enthalpy, in a thermodynamic system, is the measure of its energy which is equal to the sum of the internal energy and the product of its pressure and volume.

$H=U+\mathrm{PV}$ (By definition)

$\Delta H=\Delta U+\Delta (\mathrm{PV}) \mathrm{or}\Delta H=\Delta U+V\Delta P+P\Delta V$

at constant pressure

$\Delta H=\Delta U+P\Delta V$ So, option A is incorrect.

$\Delta U=q+W$ First law of thermodynamics.

${\Delta S}_{\mathrm{sys}}+{\Delta S}_{\mathrm{surr}}\geq 0\mathrm{or}{\Delta S}_{\mathrm{Universe}}\geq 0$ A form of second law of thermodynamics.

$\Delta G=\Delta H-T\Delta S$ Second law of thermodynamics.

Your note

JEE Main Physical Chemistry in other years

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Work through every JEE Main Physical Chemistry PYQ, year by year.

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JEE Main 2022 — Chemistry Physical Chemistry

2022mcqeasy

Which of the following relation is not correct?

Official previous-year question

Held on 28 Jul 2022 · Verified 6 Jul 2026.

Options

A
$\Delta H=\Delta U-P\Delta V$
B
$\Delta U=q+W$
C
${\Delta S}_{\mathrm{sys}}+{\Delta S}_{\mathrm{surr}}\geq 0$
D
$\Delta G=\Delta H-T\Delta S$

Did you get this right?

Solution

Enthalpy, in a thermodynamic system, is the measure of its energy which is equal to the sum of the internal energy and the product of its pressure and volume.

$H=U+\mathrm{PV}$ (By definition)

$\Delta H=\Delta U+\Delta (\mathrm{PV}) \mathrm{or}\Delta H=\Delta U+V\Delta P+P\Delta V$

at constant pressure

$\Delta H=\Delta U+P\Delta V$ So, option A is incorrect.

$\Delta U=q+W$ First law of thermodynamics.

${\Delta S}_{\mathrm{sys}}+{\Delta S}_{\mathrm{surr}}\geq 0\mathrm{or}{\Delta S}_{\mathrm{Universe}}\geq 0$ A form of second law of thermodynamics.

$\Delta G=\Delta H-T\Delta S$ Second law of thermodynamics.

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

Browse all Chemistry topics

JEE Main 2022 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry

JEE Main 2022 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry