Chapter Exam

Chapter 9: Electro Chemistry — Online MCQ Test

Q: What is the unit of electrical conductance?

Answer: B. Siemens — Conductance is the reciprocal of resistance, and its SI unit is Siemens (S).

Q: The Nernst equation is used to calculate:

Answer: B. Cell emf under non-standard conditions — The Nernst equation relates electrode or cell potential to concentration and temperature under non-standard conditions.

Q: In the lead storage battery, during discharge, the active material at both electrodes is converted mainly into:

Answer: B. PbSO4 — During discharge, both the lead anode and lead dioxide cathode are converted into lead sulfate.

CHEMISTRY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 9: Electro Chemistry with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th CHEMISTRY. This chapter covers: Diving into electrochemical cells this chapter details conductance Nernst equation and cell EMF calculations. It examines electrolysis Kohlrausch law battery technologies corrosion.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 9: Electro Chemistry — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th CHEMISTRY — Chapter 9: Electro Chemistry, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the unit of electrical conductance?

A. Ohm
B. Siemens ✓
C. Volt
D. Farad

Answer: B. Siemens
Conductance is the reciprocal of resistance, and its SI unit is Siemens (S).

The Nernst equation is used to calculate:

A. Rate of reaction
B. Cell emf under non-standard conditions ✓
C. Molarity of a solution
D. Heat of reaction

Answer: B. Cell emf under non-standard conditions
The Nernst equation relates electrode or cell potential to concentration and temperature under non-standard conditions.

Which statement is correct for a galvanic cell?

A. It converts electrical energy into chemical energy
B. It converts chemical energy into electrical energy ✓
C. It requires an external power source to work
D. Oxidation occurs at the cathode

Answer: B. It converts chemical energy into electrical energy
A galvanic cell produces electrical energy from a spontaneous chemical reaction.

A concentration cell is based on the difference in:

A. Electrode material
B. Pressure of gases
C. Concentration of the same species in two half-cells ✓
D. Temperature only

Answer: C. Concentration of the same species in two half-cells
In a concentration cell, both electrodes are identical and emf arises due to concentration difference.

In the lead storage battery, during discharge, the active material at both electrodes is converted mainly into: