Question

Choose the correct statements from the following . ?
(a) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal
(b) beryllium stable is readily soluble in water as the greater hydration enthalpy of $Be2+$ very the lattice enthalpy factor
(c) Beryllium exhibits coordination number more than four
(d) Beryllium oxide is purely acidic in nature

Answer 1

Answers:

(a) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal
(b) beryllium sulphate is readily soluble in water as the greater hydration enthalpy of $Be2+$ overcomes the lattice enthalpy factor

Due to the diagonal relationship, beryllium is similar to aluminium. It also forms an oxide film which is very stable on the surface of the metal
Beryllium sulphate is soluble in water due to high hydration energy. Beryllium does not exhibit coordination number moire than four. Like $A{l}_2{O}_3.BeO$ is amphoteric in nature
the anomalous behaviour of be is mainly due to its very small size and partly due to its high electronegativity. These two factors increaseth the polarising power of $B{e}^{2+}$ ions to such extent that it becomes significantly equal to the polarising power of $A{l}^{3+}$ ions. therefore, these two elements Be and Al resemble (diagonal relationship) very much Polarising power $=\frac{lonicchagarge}{(Ionicradii{)}^2}$