MCQ
Adsorption of gases on solid surface is generally exothermic because
- AEnthalpy is positive
- ✓Entropy decreases
- CEntropy increases
- DFree energy increase
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$\begin{array}{*{20}{c}}
{OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - CH - COOH\xrightarrow{\Delta }}
\end{array}$
The heat of the reaction $2Mg + Si{O_2} \to 2MgO + Si$ is......$kJ$

| Condition | Temperature |
| $(1)$ Spontaneous | $(p)$ $273\,K$ |
| $(2)$ At equilibrium | $(q)$ $260\, K$ |
| $(3)$ Non-spontaneous | $(r)$ $280\, K$ |