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Question

Whic of the following can act as both a bronsted Acid and base ?

A
O+2
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B
HCl
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C
Na2CO3
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D
HSO4
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Solution

The correct option is D HSO4
A Bronsted-Lowry acid is defined as substance that releases H+ ions; a Bronsted-Lowry base is defined as substance that accepts H+ ions. In the given option O+2​ neither gives nor accepts H+ ion. HCl only gives H+ thus is an acid. Na2CO3​ can accept H+ thus is a base. But HSO4​ can accept H+ to form H2SO4 and can release one H+ to form SO24​, therefore it can act as both Bronsted acid and Bronsted base.

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