Which of the following reaction involves the liberation of energy?

1.	Which of the following reaction involves the liberation of energy?
Answer» `Na_(s) rarrNa_(g)^(+)` `CI_(2(g)) RARR Na_((g))^(+) +CI_((g))^(-)` `Na_((g))^(+)+CI_((g))^(-)rarrNaCI_((s))` `NaCI_((s))rarrNa_((g))^(+)+CI_((g))^(-)` ANSWER :C

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