The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As_2S_3 are given below:I. (NaCl) = 52, II. (BaCl_2) = 0.69,III. (MgSO_4) = 0.22The correct order of their coagulating power is

1. II > I > III

2. III > II > I

3. III > I > II

4. I > II > III

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 neet Save WhatsApp Report

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Answer: 2. III > II > I

Key idea: coagulating power is inversely proportional to coagulation value (the minimum amount needed).

Smaller value means more powerful: III (0.22) > II (0.69) > I (52).

Also, the sol \(As_2S_3\) is negative, so the cation charge matters (Hardy-Schulze rule): \(Mg^{2+}\) and \(Ba^{2+}\) beat \(Na^+\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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