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Chemical Kinetics Factors Influencing Rate of a Reaction
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CHEMICAL KINETICS Questions and Answers PDF
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- Write the unit of rate of reaction.
Ans. mole lit–¹ sec–¹
- A substance with initial concentration 2M follows zero order kinetics with rate constant 2 x 10 M sec. How long will this reaction take to go to completion ?
Ans. We know K = x/t
Here x 2M, K = 2 x 10-2M sec
t=x/k{ 2m/ 2×10 M sec=100 sec
Hence it will take 100 sec for completion of the
reaction.
- The rate of reaction is doubled for every 10°C rise in temperature. If the temp is raised from 30°C to 70°C the rate of reaction will be increased by how many times ?
Ans. Rise in temperature 40°C
Rate of reaction will be, 24=16 times the initial rate.
- Inversion of Cane Sugar is an example of -order reaction.
Ans. Pseudofirst
- What is the relationship between rate constant and half life period of a 1st order reaction ?
Ans. t1/2=(0.693/k)
K = rate constant of the reaction.
half life period of the reaction.
- Activation energy for a chemical reaction depends upon.
Ans. Nature of reactant.
- For a 1st order reaction the time required for times, the time required 75% completion is – for 50% completion.
Ans. 2
- In all reactions increase in concentration of reactants increases rate of reaction. Yes or No.
Ans. No, in zero order reactions rate of reaction is independent of concentration of reactant.
- The unstable intermediate compound formed by reactants after absorption of activation energy is called as___
Ans. Activated complex
- Decomposition of H202 takes place in the following way
H2O,→ H20+0] x 2 (slow)
O+0- 02 (fast)
2H202→2H20+02
What is the order of overall reaction ?
Ans. Order is determined from the slowest step. So order of the reaction is 1.
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