One liter of 1M of NaOH will complete neutralize one liter of...?

Okay, since the NaOH is a strong base, it will deionize in solution to OH- and Na+. The deionized OH- is basic, and needs to be neutralized by the H+ from the acid. Since there are 2H in every H2SO4, that is where the 2:1 ratio comes from. 1M NaOH is one mol of OH every liter, and .5 means that there half a mole of H2 every liter, which are equal amounts of OH- and H+, causing a neutralization.