The values of heat of formation of ${SO}_{2} and {SO}_{3}$ are $- 398.2 kJ and - 198.2 kJ .$ The heat of reaction of the following reaction will be ${SO}_{2} + \frac{1}{2} O_{2} \to {SO}_{3}$

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$- 200 kJ$

$- 356.2 kJ$

$+ 200 kJ$

$- 396.2 kJ$

answer is A.

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