The apparatus shown is used to measure the speed of a reaction.
Which equation represents a reaction where the speed can be measured using this apparatus?

$Mg\left( s \right) + 2HCl\left( {aq} \right) \to MgC{l_2}\left( {aq} \right) + {H_2}\left( g \right)$
2 )
$HCl\left( {aq} \right) + NaOH\left( {aq} \right) \to NaCl\left( {aq} \right) + {H_2}O\left( l \right)$
3 )
$Fe\left( s \right) + CuS{O_4}\left( {aq} \right) \to Cu\left( s \right) + FeS{O_4}\left( {aq} \right)$
4 )
$2Na\left( s \right) + B{r_2}\left( l \right) \to 2NaBr\left( s \right)$
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