(a(i))[4]
Describe and explain the pattern in the solubility of the Group 2 hydroxides down the group.
(a(ii))[2]
The Group 2 hydroxides decompose on heating to produce the corresponding metal oxide and water vapour. Suggest which of $\text{Mg(OH)}_2$ and $\text{Sr(OH)}_2$ will decompose at a lower temperature. Explain your answer.