Cu+H2SO4dilute→products; The products are

In H2SO4, H+ and SO4-2can get reducedCu cannot reduce H+ but can reduce SO4-2when dilute H2SO4 is used SO4-2 cannot be reduced by Cu and it never can reduce H+ ionThus Copper cannot react with dil.H2SO4No doubt when conc.H2SO4 is used then 'Cu' can reduce SO4-2 to SO2