(a(i))[4]
Describe and explain the pattern in the solubility of the Group 2 hydroxides as you go down the group.
(a(ii))[2]
When Group 2 hydroxides are heated, they decompose to form the matching metal oxide and water vapour. Suggest which of $\text{Mg(OH)}_2$ and $\text{Sr(OH)}_2$ decomposes at the lower temperature. Explain your answer.