question_answer

An example of a cyclic silicate is

A)  beryl                                    

B)  zeolite

C)  talc                       

D)         feldspar

Correct Answer: A

Solution :

If two oxygen atoms per tetrahedron are shared to form closed rings such that the structures with the general formula \[(SiO_{3}^{2-})\] or \[(Si{{O}_{3}})_{n}^{2n-}\] are obtained, the silicates containing these anions are called cyclic silicates. For example, in beryl \[(B{{e}_{3}}A{{l}_{2}}S{{i}_{6}}{{O}_{18}})\] the anion \[S{{i}_{6}}O_{18}^{12-}\] is cyclic silicate.