Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3, and NH4Cl, the most effective coagulating agent for Sb2S3 sol is
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Al2(SO4)3 is your answer
As Sb2S3 is a negative sol, so, Al2(SO4)3 will be the most effective coagulant due to higher charge density on Al3+ in accordance with Hardy-Schulze rule. Order of effectiveness of cations: Al3+ > Ca++ > Na+ > NH4+
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Explanation:
A12(so4)3 is your answer
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