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JEE Main2004ChemistrySome Basic Concepts of ChemistryActual

To neutralize completely 20 ~mL of 0.1 M aqueous solution of phosphorous acid ( H ₃ PO ₃ ) , the volume of 0.1 M aqueous KOH solution required is

Options

  1. A10 ~mL
  2. B60 ~mL
  3. C40 ~mL
  4. D20 ~mL

Correct answer

C. 40 ~mL

Step-by-step solution

No. of gm equivalents of phosphorous acid = No . of gm equivalents of KOH aligned & 20 0.1 2(n= factor )=0.1 V & =0.1 V aligned V = 4 0.1 =40 ml

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