Match the entries in column - I (type of silicate) and column - II (basic structural unit) and select the correct answer.
| Column - I | |
| Column - II | |
| P. Sorosilicates | 1. Si4O11-6 |
| Q. Double Chain Silicates | 2. Si2O7-6 |
| R. Phyllosilicates | 3. SiO4-4 |
| S. Nesosilicates | 4. Si2O5-2 |
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