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Q.

(A) : The second electron affinity of oxygen is exothermic.
(R) : Oxygen is the highest electronegative element.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is D.

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Detailed Solution

detailed_solution_thumbnail

When we add second electron we need to supply energy to oxygen anion because of electron-electron repulsion. Hence endothermic. 

As oxygen gets octet if it accepts 2 electrons and due to small size it is second more electronegative atom.

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