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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

Which one of the following species acts as both Bronsted acid and base?

Options

  1. AH 2 P O 2 -
  2. BH P O 3 − 2
  3. CH P O 4 − 2
  4. DAll of these

Correct answer

C. H P O 4 − 2

Step-by-step solution

H P O 4 2 - + H 2 O ⇌ H 2 P O 4 - + O H - H P O 4 2 - + H 2 O ⇌ P O 4 3 - + H 3 O + H 2 P O 2 - is a conjugate base of H 3 P O 2 (a monobasic acid) and does not give H + , H P O 3 2 − is a conjugate base of H 2 P O 3 - and does not ionise further. Since, H 2 P O 3 is a dibasic acid, H P O 4 2 − can both accept or donate a proton.

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