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

The formation of oxide ion O^(2-)(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below O(g)+e^(-) rarr O^(-)(g), DeltaH^(-) = - 141 kj mol^(-1) O^(-)(g) +e^(-) rarr O^(2-) (g), DeltaH^(-) =+ 780 kj mol^(-1) Thus, process of formation of O^(2-) in gas phase is unfavourable even through O^(2-) is isoelectronic with neon. It is due to the fact that A) oxygen is more electronegative B) addition of electron in oxygen results in larget size of the ion C) electron repulsion outweights the stability gained by achieving noble gas configuration D) O^(-) ion has comparatively smaller size than oxygen atom

The volume of O_(2) liberated from 0.96g of H_(2)O_(2) is

The volume of O_(2) liberated from 0.96g of H_(2)O_(2) is

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