Răspuns:
I.
2Al + 3H2SO4→ … Al2(SO4)3+ 3H2↑
CaCl2 + K2CO3 → CaCO3↓ + 2KCl
MgO + 2HNO3 → Mg(NO3)2 + H2O
NiCl2 +2 NaOH → Ni(OH)2↓+ 2NaCl
II.
MgO + 2HCl=> MgCl2 + H2O
2Li + 2HNO3 => 2LiNO3 + H2 ↑
2Na+ 2H2O => 2NaOH + H2↑
3Ca(OH)2+2H3PO4 => Ca3(PO4)2 + 6H2O
MgO + 2HCl => MgCl2 + H2O