(a)[1]
Write the equation for the thermal decomposition of $\text{Mg(NO}_3\text{)}_2$.
(b)[2]
State which of $\text{Mg(NO}_3\text{)}_2$ or $\text{Sr(NO}_3\text{)}_2$ decomposes at the lower temperature. Explain your answer.
(c(i))[1]
Magnesium oxide, $\text{MgO}$, and strontium oxide, $\text{SrO}$, both react with dilute sulfuric acid. $\text{MgO}$ gives a soluble salt, A. $\text{SrO}$ gives an insoluble salt, B. Identify the products formed when $\text{MgO}$ reacts with dilute sulfuric acid.
(c(ii))[3]
Explain why A has a higher solubility than B.