Which one of the following anions is present in the chain structure silicates ? (a) Si O - (b) n (Si O ) - (c) n (SiO ) - (d) SiO - Ans. (c) Sol. There are two general formula of anions of chain silicates are n SiO - and n Si O - .The other name of chain silicates is pyroxenes. Hence, the correct option is (c). 142. Which of the following properties correctly explain SiO₂ ?