# CBSE Class 12 Chemistry Worksheet - Chemical Kinetics

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CBSE Class 12 Chemistry Worksheet - Chemical Kinetics. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

CHEMICAL KINETICS

Q1) Define

a) rate of a reaction

b) activation energy

Q2) The decomposition of PH3 follows the following reaction

4PH3 →P4 + 6H2

Rate equation is → Rate = k [PH3]. The Half life of PH3 is 37.9 sec at 120°C

a) How much time is required for 3/4th of PH3 to decompose? Ans[75.82 sec]

b) What fraction of the original sample of PH3 remains behind after one minute? Ans[2.995]

Q3) Define

a) order of reaction

b) molecularity of a reaction

Q4) the rate of a reaction increases four times when the temperature changes from 300K to 320K. Find the activation energy. (R=8.314 J/K/mol) Ans [35.34 KJ/mol]

Q5) A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when a) conc. Of B alone is increased to 3 times? b) the conc. A as well as B are doubled?

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