Silicates And Silicones

Silicones are organosilicon polymers built on a backbone of alternating silicon and oxygen atoms, with organic groups such as methyl attached to each silicon. The silicon-oxygen bond is very strong and thermally stable, giving silicones resistance to high temperatures and chemical attack. At the same time, the non-polar organic side groups point outward and make the surface hydrophobic, so silicones repel water. These combined properties make them useful as water-repellent coatings, lubricants, sealants, and heat-resistant materials. The option that they are ionic is incorrect, since silicones are covalent polymers. The option that they dissolve in water contradicts their hydrophobic nature. The option that they decompose easily is wrong, as their strong Si-O bonds make them durable. The structure and uses of silicones are a standard NCERT Group 14 topic. Examiners frequently test whether a student can connect silicon-oxygen backbone with the underlying principle rather than merely recalling an isolated fact. This concept also bridges to Chemical Bonding and Molecular Structure and Some Basic Principles of Organic Chemistry, so mastering it strengthens performance on linked questions from those topics as well. Plausibility check: the strong inorganic backbone plus non-polar organic groups logically yield both heat resistance and water repellency, confirming the chosen property.