1)+Met
Cu + 4HNO3(conc) = Cu(NO3)2 + 2NO2 + 2H2O
2)+basic oxide
MgO + 2HNO3(conc) = MgNO3 + H2O
3)+non-metall
P + HNO3(conc) = H3PO4 + NO2 + H2O (I dont want to write coefficients^)
4)+acidic oxide(Reductant)
P2O3 + HNO3(conc) = H3PO4 + NO2 + H2O (again, not write coefficients)
5)+Basic, alkali for example
NaOH + HNO3 = NaNO3 + H2O
6)+Acid (Reductant)
H2S + HNO3 = H2SO4 + NO2 + H2O ( again, not write coefficients)
7)+Salt(reductant, cause all nitrates are soluble in water)
K2S + HNO3 = K2SO4 + H2O + NO2 ( again, not write coefficients)
For 5-9 class it's quite^)
Cu + SO4 + Ba + 2Cl = Cu + 2Cl + BaSO4
SO4 + Ba = BaSO4
3ZnSO4 + 2K3PO4 = Zn3(PO4)2 + 3K2SO4
3Zn + 3SO4 + 6K + 2PO4 = Zn3(PO4)2 + 6K + 3SO4
3Zn + 2PO4 = Zn3(PO4)2
2HBr + Ca(OH)2 = CaBr2 + 2H2O
2H + 2Br + Ca(OH)2 = Ca + 2Br + 2H2O
2H + Ca(OH)2 = Ca + 2H2O