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(D) Arsenic sulphide $As_2S_3$ is a negatively charged sol. It will be coagulated by ions carrying a positive charge. In the given options,the cations

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Aluminium nitrate

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(D) Arsenic sulphide $As_2S_3$ is a negatively charged sol. It will be coagulated by ions carrying a positive charge. In the given options,the cations are $Mg^{2+}$,$K^+$,$K^+$,and $Al^{3+}$. According to the Hardy-Schulze rule,the greater the valence of the coagulating ion,the greater is its coagulating power. Since $Al^{3+}$ has the highest positive charge $(+3)$,it has the maximum coagulating power. Therefore,the minimum concentration of $Al(NO_3)_3$ is required to coagulate the $As_2S_3$ sol.

The concentration of electrolyte required to coagulate a given amount of $As_2S_3$ sol is minimum in the case of

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