Question

In feldspar and zeolite, $S{i}^{4+}$ ions are replaced by which ions?

• A. Oxide ion
• B. Hydroxide ion
• C. Aluminium ion
• D. Potassium ion

Answer 1

Answer: (C)

Aluminium ion

Generally, the ion exchange tendency of a material depends on the extent of isomorphous substitution in the tetrahedral framework. Thus, the $S{i}^{4+}$ ions of feldspar and zeolite are replaced by $A{l}^{3+}$ (aluminium ion).