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A chemist uses 0.25 L of 2.00 M H2SO4 to completely neutralize a 2.00 L of solution of NaOH. The balanced chemical equation of the reaction is given below.

2NaOH + H2SO4 Right arrow. Na2SO4 + 2H2O

What is the concentration of NaOH that is used?
0.063 M
0.25 M
0.50 M
1.0 M