NCERT Solutions For Class 12 Chemistry Chapter 4: Chemical Kinetics

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NCERT Solutions for Class 12 Chemistry Chapter 4 Chemical Kinetics deals with the study of the rate of reaction and variables that affect chemical reactions. Some of the important topics covered in this chapter are as follows:

Expected no. of questions: 2 to 4 questions of 7 marks.

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NCERT Solutions for Class 12 Chemistry Chapter 4

The NCERT Solutions for Class 12 Chemistry Chapter 4 Chemical Kinetics is as given below.

Class 12 Chemistry Chapter 4 Chemical Kinetics – Important Topics

Chemical kinetics deals with the rate of chemical reactions. A chemical reaction is a process in which one or more reactants are converted to one or more products. Rate of reaction is the rate at which the concentration of either reactants or products gets increased or decreased.

Rate = K[A]^x [B]^y

Arrhenius equation established the relation between temperature and rate constant.

Arrhenius Equation k = Ae^-Ea/RT

Half life of a reaction is the time taken by the reactants to reduce its concentration to half compared to its initial concentration.

Half Life T_½ = 0.693/k

Order of Reaction is the sum of powers of the exponent in the rate equation. There are 3 orders of reaction, namely,

Zero order reaction
First order reaction
Second order reaction
Pseudo first order reaction

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CBSE CLASS XII Related Questions

1.
Conductivity of \( 2.5 \times 10^{-4} \) M methanoic acid solution is \( 5.25 \times 10^{-5} \) S cm\(^{-1}\).
(a) Calculate its molar conductivity.
(b) Calculate its degree of dissociation.
[Given : \( \lambda^{\circ}_{(\mathrm{H^+})} = 349.5 \) S cm\(^2\) mol\(^{-1}\) and \( \lambda^{\circ}_{(\mathrm{HCOO^-})} = 50.5 \) S cm\(^2\) mol\(^{-1}\)]
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2.
Consider the decomposition of hydrogen peroxide \( (\mathrm{H_2O_2}) \) as per the equation given below : \[ 2\mathrm{H_2O_2} \xrightarrow[\text{Alkaline medium}]{I^-} 2\mathrm{H_2O} + \mathrm{O_2} \] The mechanism for this reaction was found to be : Step I : \( \mathrm{H_2O_2} + I^- \longrightarrow \mathrm{H_2O} + IO^- \) (slow) Step II : \( \mathrm{H_2O_2} + IO^- \longrightarrow \mathrm{H_2O} + I^- + \mathrm{O_2} \) (fast) (a) Write the rate law expression. (b) Determine the order of reaction with respect to \( \mathrm{H_2O_2} \), \( I^- \) and overall order of reaction. (c) What is the molecularity of the reaction in Step II ?
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3.
(a) Define 'Denatured Protein' with an example.
(b) What happens when glucose reacts with HCN ? Write the reaction involved.
(c) Name the disease caused by the deficiency of Vitamin C.
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4.
Draw the structure of 'X' in the following reaction:
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5.
Write the name of basic building units of proteins and nucleic acids. How can you differentiate between Fibrous and Globular proteins on the basis of their structures ?
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6.
A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?
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