For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective ?

For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective ?
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For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective ? A. `Na_( ... (3)` C. `BaCl_(2)` D. `NaCl`
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