Question

Samples of four metals A, B, C, and D were added one by one to the following solutions. The results obtained were tabulated as follows:

Use the table above to answer the following questions about metals A, B, C, and D: 
(i) Which is the least reactive metal? 
(ii) What would be observed if C is added to a solution of copper sulphate? 
(iii) Arrange the metals A, B, C, and D in the order of their decreasing reactivity.

Hint:

The reactivity of metals can be determined by observing whether they displace other metals from their solutions. More reactive metals displace less reactive ones.

Answer 1

(i) Least reactive metal: Metal D is the least reactive because it does not react with any metal solutions.
(ii) Observation with C and copper sulphate: C will not displace copper from copper sulphate; therefore, no change is expected.
(iii) Decreasing reactivity order: A>B>C>D. This order is derived from the displacement reactions, with A being the most and D being the least reactive.