A negatively charged suspension of clay in water will need for precipitation the minimum amount of:

aluminium chloride

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potassium sulphate

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sodium hydroxide

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hydrochloric acid

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Solution

The correct option is A aluminium chloride
As the coagulating power of $A l^{3 +}$ is highest due to high charge and small size, therefore, aluminium chloride will be required in minimum amount to coagulate negatively charged suspension of clay in water.

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