Question

Among the electrolytes Na2​SO4​, CaCl2​, Al2​(SO4​)3​, and NH4​Cl, the most effective coagulating agent for Sb2​S3​ sol is

Answer 1

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+

Answer 2

Explanation:

A12(so4)3 is your answer