QJEEM22Ch54a0: JEE Main 2022 Chemistry - Class 11 JEEM22Ch54a0 Solution: G vs T plot for the formation of MgO, involving reaction 2Mg +…

Question

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$\Delta$ G $^\circ$ vs T plot for the formation of MgO, involving reaction

2Mg + O₂ $\to$ 2MgO, will look like :

A https://ik.imagekit.io/novatra/photos/9024820d4b0d10dfa9c376373da4a888b3617fd737090045a150fbf7587fd902.webp
B https://ik.imagekit.io/novatra/photos/a5130e1ab09ee3943b08adfc6e784391bb707b3185a71954b1e2e7a73147adf4.webp
C https://ik.imagekit.io/novatra/photos/9d5f35c54a8712fa1244d85fa9277868372c93d0bc6d5f9191d1e027a364a1d5.webp
D https://ik.imagekit.io/novatra/photos/753ef6efe073a67b193b03c1faff310dcd39c05c9dbd896887f7479d24925fca.webp

Accepted Answer

For the reaction,

\begin{aligned}&amp;2 \mathrm{Mg}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{MgO}(\mathrm{s}) \\\\&amp;\Delta S^{\circ}=-v e \\\\&amp;\Delta G^{\circ}=\Delta H^{\circ}-T \Delta S^{\circ}\end{aligned}

-T \Delta S^{\circ}

is positive,

Hence,

\Delta G^{\circ}

increase with increase in temperature.

Also, when there is phase change there is an abrupt increase in the slope.

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