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Molar and Specific Heat Capacity

The oxidation...

Question

The oxidation of $S O_{2}$ by $O_{2}$ to $S O_{3}$ is an exothermic reaction. The yield of $S O_{3}$ will be maximum if:

A

Temperature is increased and pressure is kept constant

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B

Temperature is reduced and pressure is increased

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C

Both temperature and pressure are increased

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D

Both temperature and pressure are reduced

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Solution

The correct option is B Temperature is reduced and pressure is increased
$S O_{2} + O_{2} ⇌ 2 S O_{3}; Δ H = - v e$
For the reaction to proceed to the right, temperature should be decreased because it is an exothermic reaction. Also, the pressure should be increased so that the reaction shifts toward that side which has fewer moles of gaseous species.

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