(a)[2]
Calculate the relative atomic mass of the lead sample from these data, giving your final answer to two decimal places. Write it as $A_r(\text{Pb})$.
(b(i))[1]
In what way does the acid-base behaviour of tin(II) oxide differ from that of tin(IV) oxide?
(b(ii))[2]
Illustrate your answer to (i) using equations that show how each oxide reacts with an appropriate acid or base, as relevant. $\text{SnO}$ $\text{SnO}_2$
(b(iii))[3]
Describe what happens, if anything, when separate samples of tin(IV) oxide and lead(IV) oxide are heated in air. Include the observations and any equations for reactions that do occur.