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.
(i) (I) The \(\mathrm{pK_b}\) value of aniline is higher than that of methylamine. Explain why.
(II) Arrange the following compounds in decreasing order of their basic strength in the gaseous phase :
\(\mathrm{NH_3}\), \(\mathrm{(C_2H_5)_2NH}\), \(\mathrm{(C_2H_5)_3N}\), \(\mathrm{C_2H_5NH_2}\)
(III) What is Hinsberg's reagent ? Mention its one use.
(ii) How will you convert the following :
(I) Nitrobenzene to Benzenediazonium chloride ?
(II) Iodomethane to Ethanamine ?
View Solution
2.
(a) What are anomers ? Explain.
(b) What happens when glucose reacts with hydroxylamine ? Write the reaction involved.
(c) Name the disease caused by the deficiency of Vitamin B\(_{12}\).
View Solution
3.
Draw the structures of major monohalo products in each of the following :
(a)
(b)
View Solution
4.
(i) A first order reaction is 20% complete in 10 minutes. Calculate the time taken when 80% of the reaction will be completed.
[Given : log 5 = 0.7, log 4 = 0.6]
(ii) For a chemical reaction \( \mathrm{R \rightarrow P} \), variation in \( \ln[\mathrm{R}] \) vs. time (t) graph is given below :
(I) Predict the order of the reaction.
(II) Write the slope of the curve.
View Solution
5.
An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
(I) does not give Tollen's test but gives a positive iodoform test.
(II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
(III) undergoes Cannizzaro's reaction.
View Solution

6.
Match Column I with Column II and choose the correct option :
Column I Column II
a. Osmotic pressure i. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
b. Elevation of boiling point ii. \( \pi = CRT \)
c. Depression of freezing point iii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
d. Relative lowering of vapour pressure iv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)

Column I	Column II
a. Osmotic pressure	i. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
b. Elevation of boiling point	ii. \( \pi = CRT \)
c. Depression of freezing point	iii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
d. Relative lowering of vapour pressure	iv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)