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V_{2} O_{5} / P t

4 N H_{3} + 5 O_{3} \to 5 O_{2} + 6 H_{2} O

C_{2} H_{4} \to C H_{2} = C H_{2}

N_{2} + 3 H_{2} = 2 N H_{3}

2 S O_{2} + O_{2} = 2 S O_{3}

ANSWER : 4

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