question_answer 70)

  Name an element of group 2 which forms an amphoteric oxide and a water soluble sulphate.

Answer:

  Beryllium Be forms amphoteric oxide, \[BeO\]and a water soluble\[BeS{{O}_{4}}\]. \[\underset{Acidic}{\mathop{BeO}}\,+2NaOH\to N{{a}_{2}}Be{{O}_{2}}+{{H}_{2}}O\] \[\underset{Basic}{\mathop{BeO}}\,+2HCl\to BeC{{l}_{2}}+{{H}_{2}}O\] \[BeS{{O}_{4}}\]is soluble in water as its hydration energy is more than lattice energy.