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The reaction $SO_2(g) + \frac{1}{2} O_2 (g) \longrightarrow SO_3(g)$ should be

(a) Endothermic
(b) Exothermic
(c) $\Delta H=0$
(d) Unpredictable

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Answer: Exothermic
The reaction involves decrease in randomness, therefore its spontaneity must be favoured by -ve sign of $\Delta H$, i.e., it must be exothermic.
answered Feb 23, 2014 by mosymeow_1

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