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The basic structural unit of silicates is:

1. SiO4⁴⁻
2. SiO3²⁻
3. SiO4²⁻
4. SiO

Correct answer: SiO4⁴⁻

Solution

The basic structural unit of silicates is the tetrahedral SiO4⁴⁻ ion, where a silicon atom is surrounded by four oxygen atoms in a tetrahedral arrangement.

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