JEE Main 2022 · 25 Jun · Shift 2 · Chemistry Q84

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ChemistryInteger+4 / -1Question 84 of 90

At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the half life was found to be 170 s. The order of the reaction is ______. [integer answer]

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Answer and worked solution

Official answer: 0

Half-life and pressure. Halving the pressure (55.5 → 27.8 kPa) halves $t_{1/2}$ (340 → 170 s), so $t_{1/2}\propto P_0$ .

Order. $t_{1/2}\propto P_0^{1-n}$ gives $1-n=1$ , $n=0$ .

Answer: 0

Topics:Half-life Order and molecularity

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JEE Main 2022 · 25 Jun · Shift 2, Chemistry question 84