Chapter 9: Electro Chemistry — Online MCQ Test
CHEMISTRY · CLASS 12th · Tamil Nadu State Board
Practice Chapter 9: Electro Chemistry with a free chapter-wise online MCQ test.
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.
Chapter 9: Electro Chemistry — Important Questions & Answers
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).
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.
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 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 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:
- A. Pb and PbO2
- B. PbSO4
- C. PbCl2
- D. PbCO3
Answer: B. PbSO4
During discharge, both the lead anode and lead dioxide cathode are converted into lead sulfate.
During discharge, both the lead anode and lead dioxide cathode are converted into lead sulfate.