CBSE Class 12 Chemistry 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.
ONE MARK QUESTIONS
1. Why does the rate of a reaction not remain constant throughout the reaction process? (2010)
2. The rate of a reaction is 1.2 x 10-3 L/mol/s. What is the order of the reaction?
TWO MARK QUESTIONS
1.Define the following terms :
a) Half-life of a reaction (t½)
b) Rate constant (k) (2015)
2.A first order decomposition reaction takes 40 minutes for 30% decomposition. Calculate its t1/2 value. (2008)
3.Show that for a first order reaction, the time required for half the change is independent of initial concentration. (2010)
THREE MARK QUESTIONS
1.A reaction is first order in A and second order in B.
a) Write differential rate equation.
b) How is the rate affected when the concentration of A is tripled?
c) How is the rate affected when the concentration of both A and B are doubled?
2.For a certain chemical reaction, variation in the concentration, ln[R] Vs time(s) plot is given below: ln[R] T(s) For the reaction
a) What is the order of the reaction?
b) Give the relationship between k and t1/2
c) What does the slope of the above line indicate? (2014)
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