How will you distinguish between the following pairs of terms:
(i) Tetrahedral and octahedral voids
(ii) Crystal lattice and unit cell

Explanation

### Step-by-Step Solution

#### Distinction between Tetrahedral and Octahedral Voids

1. **Definition of Tetrahedral Voids**:
- Tetrahedral voids are the spaces in a crystal lattice that are surrounded by four atoms or ions. These voids are formed when four spheres (representing atoms or ions) are positioned at the corners of a tetrahedron.

2. **Visual Representation**:
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