Give an example to show the effect of concentration of nitric acid on theformation of oxidation product.
dilute and concentrated nitric acid give different oxidation product
EXAMPLES ARE:
4Zn +10HNO3(dil) 
4Zn(NO3)2 + NH4NO3 + 3H2O
4Zn +10HNO3(dil) 
4Zn(NO3)2 + N2O + 5H2O
4Zn +4HNO3(conc.) 
Zn(NO3)2 + NO2 + 2H2O
1