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The energy evolved is highest for which of the following reactions

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The energy evolved is highest for which of the following reactions
A. `F+e^(-)rarrF^(-1)`
B. `Cl+e^(-)rarrCl^(-)`
C. `S+2e^(-)rarrS^(2-)`
D. `O+2e^(-)rarrO^(2-)`
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Correct Answer - B
Due to high electron affinity of Cl the highest energy is evolved.
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