A) Orthophosphoric acid
B) Hypophosphorus acid
C) Metaphosphoric acid
D) Pyrophosphoric acid
Correct Answer: D
Solution :
Pyrophosphoric acid\[({{H}_{4}}{{P}_{2}}{{O}_{7}})\]contains four \[pOH\]groups and hence, it is a tetrabasic acid. \[HO-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{P}}}\,-O-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{P}}}\,-OH\]
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