Chapter Exam

Unit 3: Electro Chemistry and Chemical Kinetics — Online MCQ Test

Q: What does the Nernst equation relate in an electrochemical cell?

Answer: A. Cell potential and concentration of ions — The Nernst equation is used to calculate the electrode or cell potential under non-standard conditions, especially when ion concentrations change.

Q: Which law states that the molar conductance of an electrolyte at infinite dilution is the sum of the individual ionic conductances?

Answer: B. Kohlrausch's law — Kohlrausch's law of independent migration of ions explains that at infinite dilution, each ion contributes independently to molar conductance.

Q: Which quantity is obtained from the slope of a plot of log k versus 1/T for a reaction?

Answer: B. Activation energy — According to the Arrhenius equation, a plot of log k versus 1/T gives a straight line whose slope is related to activation energy.

Q: The rate constant of a reaction increases four times when temperature is raised from T to T + 10 K. This indicates that the reaction has:

Answer: B. Very high activation energy — A large increase in rate constant with a small rise in temperature suggests that the reaction is highly sensitive to temperature, which is characteristic of a high activation energy.

CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 3: Electro Chemistry and Chemical Kinetics with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY. This chapter covers: This chapter covers Nernst equation Kohlrausch Law conductance battery types rate laws reaction orders Arrhenius equation activation energy and collision theory.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 3: Electro Chemistry and Chemical Kinetics — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY — Unit 3: Electro Chemistry and Chemical Kinetics, with answers and explanations. These are sample questions; the exam has its own separate question set.

What does the Nernst equation relate in an electrochemical cell?

A. Cell potential and concentration of ions ✓
B. Cell potential and temperature only
C. Resistance and conductance
D. Rate constant and activation energy

Answer: A. Cell potential and concentration of ions
The Nernst equation is used to calculate the electrode or cell potential under non-standard conditions, especially when ion concentrations change.

Which law states that the molar conductance of an electrolyte at infinite dilution is the sum of the individual ionic conductances?

A. Faraday's law
B. Kohlrausch's law ✓
C. Ohm's law
D. Raoult's law

Answer: B. Kohlrausch's law
Kohlrausch's law of independent migration of ions explains that at infinite dilution, each ion contributes independently to molar conductance.

Which quantity is obtained from the slope of a plot of log k versus 1/T for a reaction?

A. Heat of reaction
B. Activation energy ✓
C. Equilibrium constant
D. Order of reaction

Answer: B. Activation energy
According to the Arrhenius equation, a plot of log k versus 1/T gives a straight line whose slope is related to activation energy.

Which statement is correct about activation energy?

A. It is the energy released in a reaction
B. It is the minimum energy required for effective collision ✓
C. It is always zero for all reactions
D. It is the difference between products and reactants only

Answer: B. It is the minimum energy required for effective collision
Activation energy is the minimum energy that reacting molecules must possess to form the activated complex and undergo reaction.

The rate constant of a reaction increases four times when temperature is raised from T to T + 10 K. This indicates that the reaction has:

A. Very low activation energy
B. Very high activation energy ✓
C. Zero order
D. Negative activation energy

Answer: B. Very high activation energy
A large increase in rate constant with a small rise in temperature suggests that the reaction is highly sensitive to temperature, which is characteristic of a high activation energy.