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Assertion: The formation of F((g))^(-) f...

Assertion: The formation of `F_((g))^(-)` from `F_((g))` is exothermic, whereas that of `O_((g))^(2-) from `O_((g))` is endotherrmic.
Reason: The addition of second electron to a monovalent anion is difficult because both have the same charge and experience more repulsion.

A

If both assertion and reason are true annd the reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but the reason is false

D

if assertion is false but the reason is true

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The correct Answer is:
A
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The formation of the oxide ion O_(g)^(2-) requires first an exothermic and then an endothermic step as shown below: O_(g)+e^(-) rarr O_(g)^(-) , DeltaH=-142 kJ mol^(-1) O(g)+e rarr O_(g)^(2-) , DeltaH=844kJ mol^(-1) This is because:

Assertion :- Bond Dissociation energy is F_(2) gt Cl_(2) Reason:- Cl_(2) have more electronic repulsion than F_(2) .

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