$Be$ and $Al$ exhibit many properties which are similar,but the two elements differ in:

How would you explain the following observations?
$(i)$ $BeO$ is almost insoluble but $BeSO_4$ is soluble in water,
$(ii)$ $BaO$ is soluble but $BaSO_4$ is insoluble in water,
$(iii)$ $LiI$ is more soluble than $KI$ in ethanol.

Beryllium shows a diagonal relationship with Aluminum. Which of the following similarities is incorrect?

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

Identify correct statements from the following:
$i$. Beryllium oxide is an amphoteric oxide.
$ii$. Group $II$ elements dissolve in liquid ammonia to form deep blue-black solutions.
$iii$. The hydration enthalpy of group $II$ ions decreases from $Be^{2+}$ to $Ba^{2+}$.

When gypsum is heated to $393 \; K$,it forms