ChemistryFor[H3PO4], H3PO4↔H2PO4-+H+(K1)H2PO4-↔HPO42-+H+(K2)HPO42-↔PO43-+H+(K3), then

For[H3PO4]

H3PO4H2PO4-+H+(K1)
H2PO4-HPO42-+H+(K2)
HPO42-PO43-+H+(K3), then

  1. A

    K1>K2>K3

  2. B

    K1<K2<K3

  3. C

    K1<K2>K3

  4. D

    K1.K2.K3=KW

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    Solution:

    It is given to find the correct relation between K values for given reactions.
    K1=[H2PO4-][H+][H3PO4]

    K2=[HPO42-][H+][H2PO4-]
    K3=[PO43-][H+][HPO42-]
    K values depend on a greater number of protons.
    Hence, the correct answer is option (A) K1>K2>K3.

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