JEE Main · 2019 · 12 Apr 2019 · Shift 1 · p-Block Elements

The basic structural unit of feldspar, zeolites, mica and asbestos is :

(A)(see structure)
(B) $(SiO_{3})^{2 -}$
(C) $SiO_{2}$
(D) $(SiO_{4})^{4 -}$ ✓ Correct

Answer: (D)

Solution

Every silicate framework, whether feldspar, zeolite, mica or asbestos, is built from the same repeating building block: the

SiO X_{4} X^{4 -}

tetrahedron, a silicon atom at the centre with four oxygens at the corners. These tetrahedra then link through shared corners in different ways to produce the various silicate structures. The basic unit is therefore

SiO X_{4} X^{4 -}

JEE Main · 2019 · 12 Apr 2019 · Shift 1 · Single correct option

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