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Question
Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observe in
(A) I and II
(B) II and III
(C) III and I
(D) All the three
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Solution
Changes will be observed in all the three solutions. This is because aluminium is more reactive than copper, zinc and iron. Hence, when added to solutions of copper sulphate, zinc sulphate and iron sulphate, it displaces copper, zinc and iron from the solution which then precipitate at the bottom.
The Correct Answer is D
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