A) Orthophosphoric acid
B) Phosphorus acid
C) Metaphosphoric acid
D) Pyrophosphoric acid
Correct Answer: B
Solution :
\[\overset{*}{\mathop{{{H}_{3}}P{{O}_{3}}\,}}\,\] \[3+x-2\times 3=0\]; \[x=6-3=+3\].
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