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What happens during a bee sting? What is its remedy?
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$\text{MnO}_2\ +\ 4\text{Hl}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{MnCl}_2\ +\ 2\text{H}_2\text{O}\ +\ \text{Cl}_2$
$\text{FeSO}_4\text{(aq)}+\text{Zn(s)}\xrightarrow{\ \ \ \ \ }\text{ZnSO}_4\text{(aq)}+\text{Fe(s)}$
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
7N, 15P, 17CI, 18Ar.