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Which salt from following forms aqueous solution having $\mathrm{pH}$ less than 7 ?
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The correct answer is:
$CuSO_4$
A salt of strong acid and weak base forms aqueous solution having $\mathrm{pH}$ less than 7 (that is, it forms an acidic solution). $\mathrm{CuSO}_4$ is salt of strong acid $\mathrm{H}_2 \mathrm{SO}_4$ and weak base $\mathrm{Cu}(\mathrm{OH})_2$.
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