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Q.

Among the electrolytes of Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is 

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a

Al2(SO4)3

b

CaCl2

c

NH4Cl

d

Na2SO4

answer is C.

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Detailed Solution

  • As Sb2S3 is a negative sol, so Al2(SO4)3 will be the most effective coagulant due to higher positive charge on Al(Al3+)− Hardy-Schulze rule. 
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