MCQ
Which of the following acid exist in polymeric form
- ✓$HP{O_3}$
- B${H_4}{P_2}{O_7}$
- C${H_3}P{O_4}$
- DNone of these

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$2MnO_4^ - + 5{C_2}O_4^ - + 16{H^ + } \to 2M{n^{ + + }} + 10C{O_2} + 8{H_2}O$
Here $20\, mL$ of $0.1\, M\, KMnO_4$ is equivalent to
here $‘X’$ is :