The effect of temperature on spontaneity of reactions are represented as : \(\begin{array}{|l|l|l|l|l|}…

The effect of temperature on spontaneity of reactions are represented as :
\(\begin{array}{|l|l|l|l|l|}
\hline & \Delta \mathrm{H} & \Delta \mathrm{~S} & \text {Temperature} & \text {Spontaneity} \\
\hline \text {(A)} & + & - & \text {any T} & \text {Non spontaneous} \\
\hline \text {(B)} & + & + & \text {low T} & \text {spontaneous} \\
\hline \text {(C)} & - & - & \text {low T} & \text {Non spontaneous} \\
\hline \text {(D)} & - & + & \text {any T} & \text {spontaneous} \\
\hline
\end{array}\)
The incorrect combinations are :
  1. (B) and (C) only
  2. (B) and (D) only
  3. (A) and (D) only
  4. (A) and (C) only

Solution

$\because \Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{~S}$
For spontaneity of reaction: $\Delta \mathrm{G}=-\mathrm{ve}$

Asked in: JEE Main 2025 (23 Jan Shift 2)

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