NEET UG CHEMISTRY MCQ: THERMODYNAMICS

1 Hard

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Application +4 | -1

For the reaction,

\mathrm{X}_2 \mathrm{O_4(l}) \longrightarrow 2 \mathrm{XO}_2(\mathrm{g}), \Delta U=2.1 \mathrm{~kcal}, \Delta S=20 \mathrm{~cal} \mathrm{~K}^{-1}

300 \mathrm{~K}

. Hence,

\Delta G

View answer and explanation

Correct option: B

-2.7 \mathrm{~kcal}

Option B (-2.7 kcal) is correct because it is calculated using the formula

\Delta G = \Delta H - T\Delta S

, where

\Delta H

is derived from

\Delta U

and the change in the number of moles of gas.

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\mathrm{H}_2 \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})