Which of the Following Mixtures Would Result in a Buffered

Multiple Choice

Which of the following mixtures would result in a buffered solution when 1.0 L of each of the two solutions are mixed.

A) 0.2 M HNO₃ and 0.2 M NaNO₃
B) 0.2 M HNO₃ and 0.4 M HF
C) 0.2 M HNO₃ and 0.4 M NaF
D) 0.2 M HNO₃ and 0.4 M NaOH