Compounds (A) and (B) are respectively:
4 mol of a mixture containing same number of moles each of NaNO3,NH4NO3,LiNO3,Ca(NO3)2,Pb(NO3)2,AgNO3,Hg2(NO3)2andZn(NO3)2 was heated strongly. Total number of moles of NO2(g) evolved is___