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Question

Conjugate base of H2PO−4 is

A
HPO24
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B
PO34
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C
H3PO4
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D
HPO4
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Solution

The correct option is A HPO24
According to the Bronsted lowry theory of acids and bases: A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.
AcidH+=conjugate base
H2PO4H+=HPO24

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