Amongst the following, which is correct about the metal sulphide sols?

The sol particles are positively charged due to preferential adsorption of metal ions

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The sol particles are negatively charged due to preferential adsorption of sulphide ions

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The anion of added electrolytes are effective in causing the coagulation of the sol

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The sol is unstabilized due to both the electric charge and hydration of the particles

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Solution

The correct option is B The sol particles are negatively charged due to preferential adsorption of sulphide ions
In metal sulphide solutions, solute particles are negatively charged due to preferential adsorption of sulphide ions. The preferential adsorption of a particular type of ions imparts a particular type of charge to colloidal particles.

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