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What is Cells?

The device which convert electrical energy into chemical energy or chemical energy into electrical energy is called cell.

Types of Cells

Cells are of two types;

1. Electrochemical Cell

The cell which convert chemical energy into electrical energy is called electrochemical cell.

Eg: Daniell cell

Daniell Electrochemical Cell Diagram

2. Electrolytic Cell

The cell which convert electrical energy into chemical energy is called electrolytic cell.

Ex- electrolysis of NaCl.

o In electrolytic cell redox reaction takes place.

o In electrolytic cell non-spontaneous (ΔG = positive) reaction type is proceed.

o For this cell, the value ΔG is positive.

The Electrolysis of Molten NaCl

If H Cl solution is take place in electrolytic cell then the following reaction takes place at cathode and at anode

H CL ⇔ H+ Cl

At cathode: H+ + e- → ½ H2(g)

At anode: Cl  → ½ Cl2(g) + e-

Electrochemical Cell Citations

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