(a)[2]
The diagram shows some apparatus used to collect gases. Which apparatus, $X$, $Y$ or $Z$, is the best choice for each gas? gas $A$ … gas $B$ …
(b(i))[1]
State why apparatus $Z$ is more suitable than apparatus $Y$ for collecting gas $C$.
(b(ii))[1]
State why apparatus $Z$ is more suitable than apparatus $X$ for collecting gas $C$.