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Assertion (A) : In the formation of oxide ion, $ O^{2-}(g) $ , first an exothermic reaction and then an endothermic reaction takes place. Reasons (R) : $O^- $ ion has comparatively large size than oxygen atom.

The correct answer is

(1) (A) is not true but, (R) is true.

(2) (A) is true, but (R) is not true

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

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

1 Answer

(3) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
answered Nov 7, 2013 by pady_1
 

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