Chemical Kinetics · JEE Main previous year questions

2018 2 questions

1. Q652018 · 15 Apr 2018 · Shift 1

   ${\text{N}}_2{\text{O}}_5$ decomposes to ${\text{NO}}_2$ and ${\text{O}}_2$ and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mmHg to 87.5 mmHg. The pressure of the gaseous mixture after 100 minute at constant temperature will be :

   1. A.175.0 mmHg
   2. B.116.25 mmHg
   3. C.136.25 mmHg
   4. D.106.25 mmHg
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   Answer: D

2. Q732018 · 8 Apr 2018 · Shift 1

   At $518^{\circ }\text{C}$ the rate of decomposition of a sample of gaseous acetaldehyde initially at a pressure of 363 Torr, was $1.00\text{Torr}{\text{s}}^{-1}$ when 5% had reacted and $0.5\text{Torr}{\text{s}}^{-1}$ when 33% had reacted. The order of the reaction is

   1. A.0
   2. B.2
   3. C.3
   4. D.1
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   Answer: B