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A reaction has $Δ H^{\circ} > 0$ and $Δ G^{\circ} > 0 at 25^{\circ} C$ This reaction :

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is at equilibrium at 25° C

could not be spontaneous under standard conditions at any temperature.

could be spontaneous under standard conditions at temperatures above 25° C

could be spontaneous under standard conditions at temperatures below 25° C.

answer is C.

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Detailed Solution

Here, we have,

$Δ G^{\circ} = Δ H^{\circ} - T Δ S^{\circ} > 0 (+)$

Either $Δ S^{\circ} < 0$ or if $Δ S^{\circ} > 0$ but T is low (298 K). Above this temperature it may be spontaneous while below this temp it is always spontaneous.

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