⚗️ Difference: Galvanic Cell vs Electrolytic Cell
| Feature | Galvanic Cell | Electrolytic Cell |
|---|---|---|
| Definition | Converts chemical → electrical energy | Converts electrical → chemical energy |
| Nature of reaction | Spontaneous | Non-spontaneous |
| Energy source | No external supply needed | Requires external battery |
| Electron flow | Anode → Cathode | Anode → Cathode (same direction) |
| Current flow | Cathode → Anode | Cathode → Anode |
| Anode charge | Negative | Positive |
| Cathode charge | Positive | Negative |
| Example | Daniell Cell | Electrolysis of water |
🔋 Key Concept (Very Important)
👉 In both cells:
Oxidation = Anode
Reduction = Cathode👉 But sign changes:
Galvanic: Anode (−), Cathode (+)
Electrolytic: Anode (+), Cathode (−)⚡ Cell Representation (Galvanic Example)
Zn | Zn^{2+} || Cu^{2+} | Cu
📝 MCQ Questions
Q1. A galvanic cell converts:
A. Electrical → chemical
B. Chemical → electrical
C. Mechanical → electrical
D. Heat → electrical
✅ Answer: B
Q2. In electrolytic cell, anode is:
A. Negative
B. Positive
C. Neutral
D. None
✅ Answer: B
Q3. Which process is non-spontaneous?
A. Galvanic cell
B. Electrolytic cell
C. Both
D. None
✅ Answer: B
Q4. In galvanic cell, cathode is:
A. Negative
B. Positive
C. Neutral
D. None
✅ Answer: B
📊 Statement-Based Questions
Q1. Consider:
Galvanic cell produces electricity
Electrolytic cell requires external energy
Anode is positive in galvanic cell
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. All
✅ Answer: A
Q2. Which are correct?
Oxidation occurs at anode
Reduction occurs at cathode
Sign of electrodes is same in both cells
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. All
✅ Answer: A
🎯 Quick Exam Trick
✔ Galvanic = Gives electricity
✔ Electrolytic = External electricity needed