In which of the following cases upon mixing, the resulting solution will be a buffer solution: I. 25 ml of 0.1 M HNO3 and 25 ml of 0.1 M NaNO3 II. 25 ml of 0.1 M NH4OH and 50 ml of 0.1 M HCl III. 50 ml of 0.1 M NaOH and 10 ml of 0.1 M H3PO3 IV. 25 ml of 0.1 M HCOOH and 25 ml of 0.1 M Ba(OH)2
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