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Question

An acid is a substance which:

A
accepts a lone pair of electron (Lewis concept)
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B
donates a proton (Lowry and Bronsted concept)
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C
acts as an acid only in presence of a conjugate base
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D
none of the above
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Solution

The correct options are
A accepts a lone pair of electron (Lewis concept)
B donates a proton (Lowry and Bronsted concept)
A Lewis acid is any substance that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor.
A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons. A Lewis base is therefore an electron-pair donor.

A Bronsted-Lowry acid is defined as anything that releases H+ ions. A Bronsted-Lowry base is defined as anything that accepts H+ ions.


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