[MP PMT 1991; MP PET 2001]
A) $ H_3PO_3 $
B) $ H_3PO_4 $
C) $ H_3PO_2 $
D) $ H_4P_2O_7 $
Correct Answer: C
$ \underset{x=+1}{\mathop{\underset{3+x+(-2\times 2)=0}{\mathop{H_3\overset{*}{\mathop{P}}O_2}}}} $
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