EASY
12th Odisha Board
IMPORTANT
Earn 100

State and explain how the molecularity and rate of reaction may be different. Give an example of pseudo unimolecular reaction.

Important Questions on Chemical Kinetics

EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 2
What do you mean by activation energy? How the activation energy can be determined?
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 3
Show that in a first order reaction, the time taken for the completion of some fraction of change is independent of the initial concentration of the reactant.
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 4
75% of a reaction of the first order was completed in 32 minutes. When was it half completed ?
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 5
Thermal decomposition of a compound is of first order. If 50% of a sample of the compound is decomposed in 120 minutes, how long would it take for 90% of the compound to decompose ?
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 6
First order reaction, A→B requires activation energy of 70 kJ mole-1. When a 20% solutions of A was kept at 25oC for 30 minutes, 25% decomposition took place. What will be percentage decomposition in the same time in a 30% solution maintained at 40oC ? Assume that activation energy remains constant in this range of temperature. 
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 7
A first order reaction is 20% complete in 10 minutes. Calculate the specific rate constant of the reaction and the time taken for the reaction for 75% completing ?
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 8
At 380oC, the half-life period for the first order decomposition of H2O2 is 360 min. The energy of activation of the reaction is 200 kJ mole-1. Calculate the time required for 75% decomposition at 450oC.
EASY
12th Odisha Board
IMPORTANT
Bureau's Higher Secondary Chemistry Volume-2>Chapter 4 - Chemical Kinetics>QUESTIONS>Q 9

The decomposition of N2O5 according to the equation

2N2O5g→4NO2g+O2g

is a first order reaction. After 30 minutes from the start of the decomposition in a closed vessel, the total pressure developed is found to be 284.5 mm of Hg and on complete decomposition, the total pressure is 584.5 mm of Hg. Calculate the rate constant of the reactions.