A) \[0.1\,M\,HCN\] and \[P{{O}_{4}}^{---}\]
B) \[HP{{O}_{4}}^{--}\] and \[{{C}_{2}}{{O}_{4}}^{--}\]
C) \[N{{H}_{4}}Cl\] and \[P{{O}_{4}}^{---}\]
D) \[P{{O}_{4}}^{---}\] and \[pH\]
Correct Answer: D
Solution :
Both possess the tendancy to accept proton.
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