# CBSE Class 12 Chemistry Chemical Kinetics (3)

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CBSE Class 12 Chemistry Chemical Kinetics (3). 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.

1. For a chemical reaction represented by R→ P the rate of reaction is denoted by –d [R]/dt or +d[P]/dt . State the significance of plus and minus sign.

2. Express the rate of reaction in terms of disappearance of hydrogen and appearance of ammonia in the given reaction.

N2(g) + 3 H2 (g) → 2NH3 (g)

3. Why rate of reaction does not remain constant throughout?

4. Write the unit of first order rate constant of a gaseous reaction if the partial pressure of gaseous reactant is given in bar.

5. What will be the order of reaction, if the rate of reaction does not depend on the concentration of any of the reactant.

6. For the elementary step of a chemical reaction :

H2 + I2 →2HI

rate of reaction →[H2] [I2]

What is the (i) molecularity and (ii) order of the reaction.

7.For a chemical reaction A→ B. The rate of the reaction is given as Rate = k [A]n the rate of the above reaction quadruples when the concentration of A is doubled. What is the value of n?

8.Mention one example of zero order reaction.

9. What is the value of the order of reaction of radioactive decay?

10. Express the relation between the half life period of a reactant and initial concentration for a reaction of nth order.

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