Which one of the following is a buffer solution?
A) 0.50 M CH3NH3Cl
B) 0.10 M H2SO4 and 0.10 NaHSO4
C) 0.50 M Ca(OH) 2 and 0.10 KCl
D) 1.0 M NaOCN and 0.2 M HOCN
E) 0.10 M NH4NO2
Correct Answer:
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