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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus
JEE Advanced levelSingle correct optionDifficulty 3 of 3pn146

A mixture contains 0.020 mol , 0.015 mol and 0.010 mol . Volume of NaOH needed for complete neutralisation of all ionisable protons is

  1. A
  2. B
  3. C
  4. D

Answer: C

Basicities are H3PO2 = 1, H3PO3 = 2, H4P2O7 = 4. Moles of NaOH = 0.020(1) + 0.015(2) + 0.010(4) = 0.090 mol. Volume = 0.090/0.50 = 0.180 L = 180 mL.
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