Equal volumes of the following solutions...

Equal volumes of the following solutions are mixed. Which form buffer ?

0.1M HCI, .02M KCN

0.1M KCN, 0.02M HCI

0.1M NH, 0.02M HCl

0.1M `H_(3),PO_(4), 0.1M` NaOH

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B, C, D

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