They are used as cation exchangers.

They have open structure which enables them to take up small molecules.

Zeolites are aluminosilicates having three dimensional network.

Some of the SiO$$_4^{4 - }$$ units are replaced by AlO$$_4^{5 - }$$ and AlO$$_6^{9 - }$$ ions in zeolites.

Among halide ions, iodide is the most powerful reducing agent.

Fluorine is the only halogen that does not show a variable oxidation state.

HOCl is a stronger acid than HOBr.

HF is a stronger acid than HCl.

B(OH)₃

PO(OH)₃

SO(OH)₂

SO₂(OH)₂

Silicon exhibits 4 coordination number in its compound.

Bond energy of F₂ is less than Cl₂.

Mn(III) oxidation state is more stable than Mn(II) in aqueous state.

Elements of 15^th group shows only + 3 and +5 oxidation states.