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The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially.

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The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found to be 4.0 min. The order of the reaction is……. (Nearest integer)

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As t1/2 is independent of initial pressure. Hence, order is 1st order.

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