25cm3 of a 0.2 mol dm3 solution of Na2CO3 requires 20 cm3 of a solution of HCl for neutralization. The concentration of the HCl solution is
-
A.
0.5 mol dm3 -
B.
0.6 mol dm3 -
C.
0.2 mol dm3 -
D.
0.4 mol dm3
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