# Diodes and their applications

### Explanation of question 3

- i = n-type material has a lattice structure having a surplus electron,
- ii = p-type material has a lattice structure having a surplus electron

1. i and ii are both true
2. i is true, but ii is false
3. i is false, but ii is true
4. i and ii are both false

The answer is :- 2 i is true; ii is false.

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