JEE MAIN - Chemistry (2025 - 23rd January Evening Shift - No. 8)
The effect of temperature on spontaneity of reactions are represented as :
| $\Delta$H | $\Delta$S | Temperature | Spontaneity | |
|---|---|---|---|---|
| (A) | $+$ | $-$ | any T | Non spontaneous |
| (B) | $+$ | $+$ | low T | spontaneous |
| (C) | $-$ | $-$ | low T | Non spontaneous |
| (D) | $-$ | $+$ | any T | spontaneous |
The incorrect combinations are :
(A) and (C) only
(B) and (D) only
(A) and (D) only
(B) and (C) only
Explanation
$$\begin{aligned}
&\because \Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{~S}\\
&\text { For spontaneity of reaction : } \Delta \mathrm{G}=-\mathrm{ve}
\end{aligned}$$
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