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Sample pieces of five metals A, …

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Sample pieces of five metals A, B, C, D and E were added to the tabulated solutions separately. The results observed are shown in the table: Metal      A No Change No Change No Change Coating on metal No Change B Grey Deposit on metal Brown Coating on metal No Change Coating on metal No Change C No Change No Change No Change No Change No Change D No Change ---------- No Change Coating on metal No Change E ----------- Brown coating New coating New coating No Change Based on the observations recorded in the table, answer the following: (1) Which is the most reactive metal? (2) Which is the least reactive metal? (3) What would be observed if metal D were added to a solution of copper (II) sulphate? (4) What would be observed if metal E were added to a solution of iron (II) sulphate? (5) Arrange the metals A, B, C, D and E in decreasing order to their reactivity?
  • 1 answers

Preeti Dabral 2 years, 9 months ago

(1) Metal E is most reactive because it displaces zinc from {tex}ZnSO_4{/tex} solution.
(2) Metal C is the least reactive since it has not displaced any of the metals from their respective salt solutions.
(3) Metal D is more reactive than Ag and less reactive than Fe. It can displace Cu from {tex}CuSO_4{/tex} solution.
(4) Since metal E has displaced Zn from {tex}ZnSO_4{/tex} solution, it is more reactive than Zinc. It is therefore expected to be more reactive than iron as well because iron is placed below zinc in the reactive series. Therefore, metal E displaces Fe from {tex}FeSO_4{/tex} solution. A grey /black coating of iron will be deposited on the metal E.
(5) Decreasing order of reactivity E>B>D>A>C

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