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Q.

The ion that is more effective for the coagulation of As₂S₃ sol is

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a

Ba²⁺

b

${PO}_{4}^{3 -}$

c

Na⁺

d

Al³⁺

answer is D.

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Detailed Solution

A negative ion causes the precipitation of positively charged sol and vice-versa. Since As₂S₃ is a negative sol so more will be the positive charge on cation more effective it will be in causing coagulation of As₂S₃ sol. Among the given ions, Al³⁺ has the greatest valency and thus is the most effective coagulating agent.

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