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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb159

Each $SiO X_{4}$ tetrahedron of a sheet silicate shares three of its four oxygen atoms with neighbours. The formula of the sheet anion per two silicon atoms is

A $Si X_{2} O X_{6} X^{4 -}$
B $Si X_{2} O X_{7} X^{6 -}$
C $Si X_{2} O X_{4} X^{2 -}$
D $Si X_{2} O X_{5} X^{2 -}$

Answer: D

Per Si: 1 terminal O and 3 shared O (counted

3/2

), i.e. 2.5 O. For two Si: 5 O. Charge

= 2 (+ 4) + 5 (- 2) = - 2

, so the repeating unit is

Si X_{2} O X_{5} X^{2 -}

.

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