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How many of the following salts have pH ...

How many of the following salts have pH less than 7 at 25°C . `NH_(4)Cl`, NaCN , `CH_(3)NH_(3)Cl` , `C_(6)H_(5)ONa` , `NaOCl` , `FeCl_(3)` , `(NH_(4))_(2)SO_(4)`, `ZnSO_(4)` , `AlCl_(3)` ,`NaNO_(3)` , `Cu(NO_(3))_(2)`

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The correct Answer is:
3
`ZnCl_(2),FeCl_(3), CuSO_(4)` are odourless.
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