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^)