| Assertion: The photochemical reactions \[{{H}_{2}}+C{{l}_{2}}\to 2HCl\] and \[{{H}_{2}}+B{{r}_{2}}\to 2HBr\] have equal quantum efficiencies. |
| Reason: Both the reactions proceed by similar mechanism. |
| Read the assertion and reason carefully to mark the correct option out of the options given below: |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
[d] \[{{H}_{2}}+C{{l}_{2}}\to 2HCl\] has much higher quantum efficiency than \[{{H}_{2}}+B{{r}_{2}}\to 2HBr\]. The first step of secondary process of \[{{H}_{2}}+C{{l}_{2}}\to 2HCl\] is exothermic while the same for \[{{H}_{2}}+B{{r}_{2}}\to 2HBr\]is endothermic.
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