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CBSE 12th Standard Chemistry Subject Chemical Kinetics HOT Questions 1 Mark Questions With Solution 2021

Published on: 28/05/2021

QB365 Provides the HOT Question Papers for Class 12 Chemistry, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

chapter: - HOT Questions

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Questions:

Generic 2

5 x 2 = 10

Consider the reaction 2A + B ⟶ Products. When concentration of B alone was doubled, half life time does not change. When conc. of A alone doubled, the rate increases by two times . What are the units of K and what is the order of reaction?

Higher molecularity reactions (viz. molecularity, 4 and above) are very rare. Why?

What is the ratio of t_3/4 : t_1/2 for a first order reaction ?

The half life period of two samples are 0.1 and 0.4 seconds. Their initial concentrations are 200 and 50 mol L^-1 respectively. What is the order of reaction?

How is half-life period related to initial concentration for a second order reaction ?

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Answers Key:

Generic 2

5 x 2 = 10

The half life is independent of conc. of B. This means the reaction is of first order w.r.t. B and w.r.t. A also it is first order and overall order is second.

Molecules of reactants collide simultaneously and go to products. The probability of colliding 4 or 5 species simultaneously is very rare.

2:1

When the initial conc. become ¼, half life becomes 4 times. Order of reaction is 2.

t_1/2 ∝a1−n.
For n = 2, t_1/2 ∝a−1,i.e.,
t_1/2 ∝ 1a
Thus, half-life period of a order reaction is inversely proportional to the initial concentration of the reactant.