A) Orthophosphorus acid
B) Orthophosphoric acid
C) Metaphosphoric acid
D) Pyrophosphoric acid
Correct Answer: D
Solution :
\[{{H}_{4}}{{P}_{2}}{{O}_{7}}\] pyrophosphoric acid \[HO-\,\,\underset{OH}{\overset{O}{\mathop{\underset{||}{\overset{||}{\mathop{P}}}\,}}}\,-O-\underset{OH}{\overset{O}{\mathop{\underset{||}{\overset{||}{\mathop{P}}}\,}}}\,-OH\] Tetrabasic (\[4-OH\] groups)
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