Which of the following is an acidic salt?

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(C) An acidic salt is formed by the partial neutralization of a polyprotic acid by a base. $NaHSO_3$ is formed from the reaction of $H_2SO_3$ (a dipro

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$NaHSO_3$

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(C) An acidic salt is formed by the partial neutralization of a polyprotic acid by a base. $NaHSO_3$ is formed from the reaction of $H_2SO_3$ (a diprotic acid) and $NaOH$. Since it still contains a replaceable hydrogen atom,it can act as an acid in aqueous solution. $Na_2S$,$Na_2SO_3$,and $Na_2SO_4$ are normal salts formed by complete neutralization.

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