Question

What will be most reactive of these metals with hydraulic acid:

mg, fe, zn, al

Answer 1

Voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive, so the most reactive is Mg