Complete the following reaction:
${SO}_{2} + O_{2} ⇌_{450 - 500 ° C}^{V_{2} O_{5}}$

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Solution

Reactions at high pressure:
Some reactions take place only when the reactants are subjected to high pressure.
For example formation of when sulphur dioxide( ${SO}_{2}$ ) reacts with oxygen( $O_{2}$ ) under high pressure, it forms sulphur trioxide( ${SO}_{3}$ ).
$\underset{sulphur dioxide}{2 {SO}_{2} (g)} + \underset{oxygen gas}{O_{2} (g)} ⇌_{450 - 500 ° C}^{V_{2} O_{5}} \underset{sulphur trioxide}{2 {SO}_{3} (g)} + Heat energy$

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