The chain length of silicones can be controlled by adding:
1. \(CH_3SiCl_3\)
2. \(SiCl_4\)
3. \((CH_3)_2SiCl_2\)
4. \((CH_3)_3SiCl\)
Which of the following compounds is used in cosmetic surgery?
1. Silica
2. Silicates
3. Silicones
4. Zeolites