Equivalent Weight of dil.HNO3 when it reacts with Zn is (At.wt of Zn = 65)

4Zn+10 HNO3(dil.)→4Zn(NO3)2+5H2O+N2OHNO3 in this reaction acts like both acid and OxidantE.W of HNO3 as an acid. It forms Zn(NO3)2No.of replaceable H-atoms in HNO3 = 1E.W of HNO3 (acid) = M/1 =ME.W of HNO3 as an Oxidant                                decrease in Ox. state =4E.W of HNO3 (oxidant) = M/4