Comment on each of the following:(i) the mobilities of alkali metal io

1.	Comment on each of the following:(i) the mobilities of alkali metal ions in aqueous solution are:Li+ < Na+ < K+ < Rb+ < Cs+(ii) Lithium is the only metal to form nitride directly.(iii) BaO is soluble but BaSO4 is insoluble in water.
Answer» (i) Small size ∝ Hydrations energy ∝ \(\frac{1}{ionic\,mobility}\) (ii) Lithium on account of its small size, shows anomalous behavior. (iii) BaO is soluble but BaSO₄ is insoluble on account of higher lattice energy of BaSO₄ than its hydration energy.

Comment on each of the following:(i) the mobilities of alkali metal ions in aqueous solution are:Li+ < Na+ < K+ < Rb+ < Cs+(ii) Lithium is the only metal to form nitride directly.(iii) BaO is soluble but BaSO4 is insoluble in water.

Answer»

(i) Small size ∝ Hydrations energy ∝ \(\frac{1}{ionic\,mobility}\)

(ii) Lithium on account of its small size, shows anomalous behavior.

(iii) BaO is soluble but BaSO₄ is insoluble on account of higher lattice energy of BaSO₄ than its hydration energy.