MolSynapsequestion bank

MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Silicon compounds: silicates, silicones, zeolites

JEE Advanced levelSingle correct optionDifficulty 3 of 3pb086

The cyclic silicate anion $Si X_{6} O X_{18} X^{12 -}$ is built from six $SiO X_{4}$ tetrahedra, each sharing two oxygens with its neighbours. The number of non-bridging (terminal) oxygen atoms in the ring is

A24
B18
C12
D6

Answer: C

Six tetrahedra each sharing two corners give

6 \times 2/2 = 6

bridging oxygens (each shared by two Si). Terminal oxygens

= 18 - 6 = 12

. Check: charge

= 6 (+ 4) - 2 (18) = - 12

, as expected.

Practice p-Block Elements: Groups 13 and 14 More on Silicon compounds: silicates, silicones, zeolites

Previous questionNext question

More questions on Silicon compounds: silicates, silicones, zeolites