The process requiring the absorption of energy is:

F \to F^{-}

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C l \to C l^{-}

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O^{-} \to O^{2 -}

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H \to H^{-}

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Solution

The correct option is D $O^{-} \to O^{2 -}$
Second electron affinity is zero for an element since already added electron repels existing electrons. Hence, it becomes difficult for an atom to take up another electron.

Therefore, the process $O^{-}$ $\to$ $O^{2 -}$ requires energy.

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Similar questions

Q. The correct order of increasing

X - O - X

bond angle is

(X = H, F or C l)

Q. The correct order of decreasing

X - O - X

bond angle is:

Which of the following is not correct?

$O r d e r o f b a s i c i t y O r d e r o f n u c l e o p h i l i c i t y (a) F^{-} > C l^{-} > B r^{-} B r_{-} > C l^{-} > F^{-} (b) H - O - O^{-} > O H^{-} H - O - O^{-} > O H^{-} (c) C H_{3} > N H_{2}^{-} > O H - C H_{3} > N H_{2}^{-} > O H^{-} (d) H_{2} O > H_{2} S H_{2} O < H_{2} S$