Which of the following is a Bronsted acid?
$(i) H C N (i i) H_{2} P O_{4}^{-} (i i i) S O_{4}^{2 -} (i v) N H_{3}$

(i), (i i)

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(i), (i i i)

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(i i i), (i v)

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(i i), (i v)

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Solution

The correct option is A $(i), (i i)$
Bronsted acid is a proton donor and Bronsted base is a proton acceptor.
$(i) H C N : Bronsted acid (i i) H_{2} P O_{4}^{-} : Bronsted acid (i i i) S O_{4}^{2 -} : Bronsted base (i v) N H_{3} Bronsted base$

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H C O O^{-}

N H_{3}

O^{2 -}

H S O_{4}^{-}

C H_{3} C O O^{-}

H_{3} O^{+}

S O_{4}^{2 -}

{N H}_{3}, {H S O}_{4}^{-}, H_{2} {S O}_{4}, {H C O}_{3}^{-}, H_{3} O

Identify Bronsted acids in the reaction : $H_{2} C O_{3} + H P O_{4}^{2 -} ⇌ H_{2} P O_{4}^{-} + H C O_{3}^{-}$

(i) P C l_{3} (i i) H_{2} O (i i i) C O_{2} (i v) N H_{3} (v) S O_{4}^{2 -} (v i) N O_{3}^{-}

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