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Which pair of solutions forms a buffer solution when equal volumes of each are mixed ?
A. 0.20 M HCl and 0.20 M NaOH
B. 0.40 M `HC_2H_3O_2` and 0.20 M NaOH
C. 0.20 M HCl and 0.20 M `NH_3`
D. 0.40 M HCl and 0.20 M `NH_3`

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