Class 12 Chemistry Electrochemistry Notes and Important Questions
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Notes for Class 12 Electrochemistry (Chemistry) are shown above.
Practice
Important Questions
The standard reduction potential of three metals A, B and C are –0.76 V, +0.34 V and +0.80 V respectively.
Define standard reduction potential.
Give the order of reducing power of metal A, B and C.
Write the cell notation when B is connected with standard hydrogen electrode (SHE)
Write the complete cell reaction of above electrochemical cell.
Calculate the standard emf of the cell
You are given the standard reduction potentials:
E°(Zn²⁺/Zn) = −0.76 V
E°(Mg²⁺/Mg) = −2.38 V
Answer the following questions:
What is the standard electrode potential?
Construct the galvanic cell notation for the given electrodes, indicating the anode and cathode.
Write the complete cell reaction for the given cell.
Calculate the cell potential for the given cell at 25°C.
Standard reduction potential values for P, Q, R and S are +0.34 V, -0.76 V, +0.0 V and -3.05 V, respectively. What is the correct order of their reducing power?
P > R > Q > S
S > R > Q > P
Q > P > S > R
S > Q > R > P
What happens when the lead storage battery is discharged?
SO₂ is evolved
PbSO₄ is consumed
Lead is formed
H₂SO₄ is consumed
Draw well labelled diagram of standard hydrogen electrode.
Why is it called reference electrode?
You are given E°Zn²⁺/Zn = –0.76 V, E°Pb²⁺/Pb = –0.13 V design a cell notation for an cell and calculate emf of the cell.
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Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
1
Question Items
1
Total Marks
1
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2082 | 1 | 1 |
Also appears in 1 model question (not counted above — model sets aren't actual NEB exam history).
Electrochemistry explores the relationship between chemical reactions and electrical energy. The chapter covers electrode potential, standard electrodes, electrochemical series, voltaic cells, cell potential and its relationship with free energy. It also introduces commercial batteries and hydrogen-oxygen fuel cells.
This page covers Electrochemistry, chapter 6 of 22 in the Class 12 Chemistry syllabus set by the National Examination Board (NEB). 5 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.