Đáp án:
2K + 2HCl --> 2KCl + H2
2Na + 2HCl --> 2NaCl + H2
Ca + 2HCl --> CaCl2 + H2
Ba + 2HCl --> BaCl2 + H2
Mg + 2HCl --> MgCl2 + H2
2Al + 6HCl --> 2AlCl2 + 3H2
Mn + 2HCl --> MnCl2 + H2
Zn + 2HCl --> ZnCl2 + H2
Cr + 2HCl --> CrCl2 + H2
Fe + 2HCl --> FeCl2 + H2
Ni + 2HCl --> NiCl2 + H2
Sn + 2HCl --> SnCl2 + H2