Question

Give any three methods for preparation of bases.

Answer 1

1. From Metals: By direct action of oxygen on highly active metals.

\[\ce{2Mg + O2 -> 2MgO}\]

2. By Action of Water on Active Metals: Highly reactive metals react with water to form soluble hydroxides.

\[\ce{2Na + 2H2O -> 2NaOH + H2 ^}\]

3. By Thermal Decomposition: Heating certain metal carbonates yields metal oxides.

\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\]