For arsenious sulphide sol,which one of the f | vedclass

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(B) Arsenious sulphide $(As_2S_3)$ sol is a negatively charged colloidal sol. According to the Hardy-Schulze rule,the coagulating power of an electrol

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$AlCl_3$

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(B) Arsenious sulphide $(As_2S_3)$ sol is a negatively charged colloidal sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte depends on the valency of the oppositely charged ion. For a negatively charged sol,the coagulating power increases with the increase in the valency of the cation. The valencies of the cations are: $Na^+$ $(+1)$,$Ba^{2+}$ $(+2)$,and $Al^{3+}$ $(+3)$. Since $Al^{3+}$ has the highest valency,$AlCl_3$ is the most effective coagulating agent.

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

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