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

Correct Answer:

Option A – 0.5 mol dm³

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