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Question
A negatively charged suspension of clay in water is needed for precipitation of minimum amount of -
Options:
A .  Aluminium chloride
B .  Potassium sulphate
C .  Sodium hydroxide
D .  Hydrochloric acid
Answer: Option A
:
A
A negatively charged clay suspension in water can be precipitated by minimum amount of Al3+(AlCl3)because Al3+ions have maximum opposite charge, i.e., +3 units

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