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Q.

Which of the following process is exothermic?

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a

O(g)→O+(g)+e-

b

S-(g)+e-→S-2(g)

c

Al+2(g)→Al+3(g)+e-

d

F(g)+e-→F-(g)

answer is D.

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Detailed Solution

(1)    .   .   .   IP of O(g)    .   .   .   endothermic(2)    .   .   .   2nd ∆Heg of S(g)   .  .   . endothermic(3)    .   .   .    IP3 of Al(g)    .   .   .  endothermic(4)    .   .   .   ∆Heg of F(g)   .   .   .  exothermic
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