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The half-life of decomposition of PH₃ for different initial pressures are given below:

P(torr) 707 620 570
t_1/2 (min) 84 84 84
The order of the reaction will be____

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answer is 1.

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Detailed Solution

For 1st order reaction,
$t_{1 / 2} = \frac{0 .693}{k}$ ; it is independent of pressure of reactant.

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