Solved: Chemistry Question for NEET

NEET ChemistryHard

For the reaction, $2\text{Cl}(g) \rightarrow \text{Cl}_2(g)$ , the correct option is :

$\Delta_r\text{H} > 0$ and $\Delta_r\text{S} > 0$

$\Delta_r\text{H} > 0$ and $\Delta_r\text{S} < 0$

$\Delta_r\text{H} < 0$ and $\Delta_r\text{S} > 0$

$\Delta_r\text{H} < 0$ and $\Delta_r\text{S} < 0$

Step-by-Step Solution

The reaction $\text{Cl}_2(g) \rightarrow 2\text{Cl}(g)$ is endothermic (requires energy to break bond). Therefore, the reverse reaction $2\text{Cl}(g) \rightarrow \text{Cl}_2(g)$ is exothermic ( $\Delta_r\text{H} < 0$ ). Since two gaseous atoms combine to form one gaseous molecule, randomness decreases ( $\Delta_r\text{S} < 0$ ).

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