Which of the following can act both as Bronsted acid and Bronsted base

Which of the following can act both as Bronsted acid and Bronsted base
  1. $\mathrm{Cl}^{-}$
  2. $\mathrm{HCO}_{3}^{-}$
  3. $\mathrm{H}_{3} \mathrm{O}^{+}$
  4. $\mathrm{OH}^{-}$

Solution

Those substance which accepts a proton are called Bronsted base and which donate a proton are called Bronsted acid
$\mathrm{HCO}_{3}^{-}+\mathrm{H}^{+} ightleftharpoons \mathrm{H}_{2} \mathrm{CO}_{3}$ Bronsted base
$\mathrm{HCO}_{3}^{-} ightleftharpoons \mathrm{H}^{+}+\mathrm{CO}_{3}^{-}$Bronsted acid ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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