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


An element from group 2 which forms an amphoteric oxide and a water soluble sulphate is beryllium.
Beryllium forms oxides of formula BeO. All other alkaline earth metal oxides are basic in nature. BeO is amphoteric in nature i.e., it reacts with acids and bases both.
Al2O3+2NaOH2NaAlO2+H2OAl2O3+6HCl2AlCl3+3H2O
Sulphate of beryllium is a white solid which crystallises as hydrated salts (BeSO4·4H2O).
BeSO4 is fairly soluble in water due to highest hydration energy in the group (small size). For BeSO4, hydration energy is more than lattice energy and so, they are readily soluble.