Which of the following species acts as Bronsted base but not as acid ?

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$C H_{3} C O O H$

$H C O_{3}^{-}$

$H_{2} P O_{2}^{-}$

$H_{2} P O_{3} -$

answer is C.

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Detailed Solution

A base is a proton acceptor, while an acid is a proton donor, according to Bronsted Lowry's theory of acids and bases. Consequently, this idea states that $H_{2} P O_{2}^{-}$ can readily give and absorb protons when reacting with water.

Therefore, the correct answer is option (C ) $H_{2} P O_{2}^{-}$ .

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