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Q.

Which of the following separation techniques can be used to separate copper oxide and copper sulphate?


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a

Boiling

b

Centrifugation

c

Distillation

d

Solubility test 

answer is D.

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Detailed Solution

Copper sulphate is the true solution. True solutions cannot be separated by physical processes. Mixtures of copper oxide and copper sulphate can be separated by a solubility test because copper oxide is insoluble in copper sulphate.
  
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