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Question: Which out of the following electrolyte solutions having the same concentration will be most effectiv...

Which out of the following electrolyte solutions having the same concentration will be most effective in causing the coagulation of arsenic sulphide sol?

A

KCl

B

MgCl2\mathrm { MgCl } _ { 2 }

C

AlCl3\mathrm { AlCl } _ { 3 }

D

NaPO4\mathrm { NaPO } _ { 4 }

Answer

AlCl3\mathrm { AlCl } _ { 3 }

Explanation

Solution

As2 S3\mathrm { As } _ { 2 } \mathrm {~S} _ { 3 }is a negatively charged sol. To cause its coagulations, the ions must be positively charged. Greater the magnitude of positive charge, grater will be its coagulating power. Thus AlCl3\mathrm { AlCl } _ { 3 } containing Al3+\mathrm { Al } ^ { 3 + }ion will be most effective in causing coagulation of As2 S3\mathrm { As } _ { 2 } \mathrm {~S} _ { 3 } .