Which of the following is a base according to Lowry-Bronsted concept?

I^{-}

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H_{3} O^{+}

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H C l

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N H_{4}^{+}

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Solution

The correct option is A $I^{-}$
According to Bronsted lowry concept acids are substances which dissociate to give hydrogen ions or protons in aqueous solution while bases are substances which dissociate to give hydroxyl ions. The acid forms its conjugate base and the base forms its conjugate acid by exchange of proton. Iodide ion accepts a proton to form conjugate acid so it is a base.

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