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Question

The tribasic acid is


A

H3PO4

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B

H3PO3

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C

H3PO2

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D

HPO3

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Solution

The correct option is A

H3PO4


The explanation for correct option:-

a) H3PO4

  • An acid that can donate three hydrogen ions to a base in a reaction is called a tribasic acid
  • Since P-H bonds are strong and are not ionic so they are not ionizable
  • O-H bonds are ionizable and hence these hydrogen ions can be donated
  • In the case of H3PO4, we have 3 P-OH bonds which means three hydrogen ions can be donated and hence it is a tribasic acid.

The explanation for incorrect options:-

b) H3PO3

  • In the case of H3PO3, we have two P-OH bonds which means two hydrogen ions can be donated and hence it is a dibasic acid.

c) H3PO2

  • In the case of H3PO2, we have one P-OH bond which means only one hydrogen ion can be donated and hence it is a monobasic acid.

d) HPO3

  • In the case of HPO3, we have one P-OH bond which means only one hydrogen ion can be donated and hence it is a monobasic acid.

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Therefore the correct option is a)H3PO4


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