Chapter 3: Metals and Non-metals

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Q
Metals and Non-metals

Question:

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

Use the table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

(ii) What would you observe if B is added to a solution of Copper (II) sulphate?

(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

Answer:

(i)- From iron, copper, zinc, and silver, iron is the most reactive metal. The metal B undergoes displacement reaction with ferrous sulphate. This means that metal B is more reactive than iron. Thus, B is the most reactive metal.

(ii)- B is the most reactive metal. When metal B is added to copper (II) sulphate solution, the blue colour of the solution fades and the red-brown deposits of copper formed on metal B.

(iii)- B is the most reactive metal because it displaces iron from the solution. Metal D does not undergo displacement reaction with any solution. So, D is the least reactive metal. C undergoes displacement reactive with silver nitrate. This means that C is more reactive than silver but less reactive than zinc, copper, and iron. Metal A undergo displacement reactive wit copper sulphate. This means that A is more reactive than copper but less reactive than iron.

Thus, the correct order of metal based on their reactivity is B > A > C > D.


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