Which of the following will produce a buffer sollution when mixed in equal volumes ?
A. `0.1" mol dm"^(-3) NH_(4)OH " and " 0.1 " mol dm"^(-3)HCI`
B. `0.05 " mol dm"^(-3) NH_(4)OH " and " 0.1" mol dm"^(-3)HCI`
C. `0.1 " mol dm"^(-3) NH_(4)OH" and "0.05" mol dm"^(-3)HCI`
D. `0.1 " mol dm"^(-3)CH_(3)COONA" and "0.1" mol dm"^(-3) CH_(3)COOH`.
