1.

Which of the following solutions having same concentration will have lowest pH value?

Answer»

KCl
`MgCl_(2)`
`AlCl_(3)`
`Na_(3)PO_(4)`

Solution :`As_(2)S_(3)` is a negatively charged sol. To cause its coagulation , the ions must be positively charged. Greater the MAGNITUDE of positive charged, greater will be its coagulating power. Thus `AlCl_(3)` containing `Al^(3+)` ion will be most effective in causing coagulation of `As_(2)S_(3)`.


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