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(C) salt of a strong acid and a weak base forms an aqueous solution with a $pH$ less than $7$ (i.e.,an acidic solution).$CH_3COONa$ is a salt of a wea

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$CuSO_4$

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(C) salt of a strong acid and a weak base forms an aqueous solution with a $pH$ less than $7$ (i.e.,an acidic solution).$CH_3COONa$ is a salt of a weak acid $(CH_3COOH)$ and a strong base $(NaOH)$,resulting in a basic solution $(pH > 7)$.$Na_2SO_4$ is a salt of a strong acid $(H_2SO_4)$ and a strong base $(NaOH)$,resulting in a neutral solution $(pH = 7)$.$CuSO_4$ is a salt of a strong acid $(H_2SO_4)$ and a weak base $(Cu(OH)_2)$,resulting in an acidic solution $(pH $Na_2CO_3$ is a salt of a weak acid $(H_2CO_3)$ and a strong base $(NaOH)$,resulting in a basic solution $(pH > 7)$.

Which salt from the following forms an aqueous solution having $pH$ less than $7$?

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