Name an element from group 2 Which forms an amphoteric oxide and a water soluble

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Solution

An element from group 2 which forms an amphoteric oxide and a water-soluble sulphate is beryllium.
The beryllium forms oxides of formula BeO. All other alkaline earth metal oxides are basis in nature. BeO is amphoteric in nature i.e., it reacts with acids and bases both. For example the amphoteric character of $A l_{2} O_{3}$
$A l_{2} O_{3} + 2 N a O H ⟶ 2 N a A l O_{2} + H_{2} O A l_{2} O_{3} + 6 H C l ⟶ 2 A i C l_{3} + 3 H_{2} O$
Sulphate of beryllium is a white solid which crystallises as hydrated salts $(B e S O_{4} . 4 H_{2} O) .$
$B e S O_{4}$ is fairly soluble in water due to highest hydration energy in the group (small size). For $B e S O_{4}$ hydration energy is more than lattice energy and so, they are readily soluble.

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