MolSynapsequestion bank

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

JEE Advanced levelSingle correct optionDifficulty 3 of 3pb160

A zeolite has the unit-cell composition $Na X_{12} [(AlO X_{2}) X_{12} (SiO X_{2}) X_{12}] \cdot 27 H X_{2} O$ . If all its $Na X^{+}$ ions are exchanged by $Ca X^{2 +}$ ions from hard water, the number of $Ca X^{2 +}$ ions taken per unit cell is

A3
B12
C6
D24

Answer: C

The framework charge is

- 12

(one per Al). Twelve

Na X^{+}

carry

+ 12

; to keep charge balance each

Ca X^{2 +}

replaces two

Na X^{+}

, so

12/2 = 6

Ca X^{2 +}

ions.

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

Select the correct statement(s) about silicones. JEE Main level
Beryl contains the cyclic silicate anion Si6O18^12- in which every SiO4 tetrahedron shares exactly two corners with neighbours. The number o... JEE Advanced level
Each SiO4 tetrahedron of a sheet silicate shares three of its four oxygen atoms with neighbours. The formula of the sheet anion per two sili... JEE Advanced level
Assertion (A): SiO2 is a high-melting solid whereas CO2 is a gas. Reason (R): Silicon forms strong ppi-ppi double bonds with oxygen, just as... JEE Advanced level
Select the correct statement(s) about silicate structures. JEE Advanced level
Select the correct statement(s) about zeolites. JEE Advanced level