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

Samples of four metals A, B, C and D were taken and added to the following solutions

Use the above table 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.


solution:
$\mathrm{A}+\mathrm{FeSO}_{4} \rightarrow$ No reaction, i.e., $\mathrm{A}$ is less reactive than iron

$\mathrm{A}+\mathrm{CuSO}_{4} \rightarrow$ Displacement, i.e., $\mathrm{A}$ is more reactive than copper

$\mathrm{B}+\mathrm{FeSO}_{4} \rightarrow$ Displacement, i.e., $\mathrm{B}$ is more reactive than iron

$\mathrm{B}+\mathrm{ZnSO}_{4} \rightarrow$ No reaction, i.e., $\mathrm{B}$ is less reactive than zinc

$\mathrm{C}+\mathrm{FeSO}_{4} \rightarrow$ No reaction, i.e., $\mathrm{C}$ is less reactive than iron

$\mathrm{C}+\mathrm{CuSO}_{4} \rightarrow$ No reaction, i.e., $\mathrm{C}$ is less reactive than copper

$\mathrm{C}+\mathrm{ZnSO}_{4} \rightarrow$ No reaction, i.e., $\mathrm{C}$ is less reactive than zinc

$\mathrm{C}+\mathrm{AgNO}_{3} \rightarrow$ Displacement, i.e., $\mathrm{C}$ is more reactive than silver

$\mathrm{D}+\mathrm{FeSO}_{4} / \mathrm{CuSO}_{4} / \mathrm{ZnSO}_{4} / \mathrm{AgNO}_{3} \rightarrow$ No reaction, i.e., $\mathrm{D}$ is less reactive than iron, copper, zinc, and silver.

From the above equations, we obtain:

Samples of four metals A, B, C and D were taken and added to the

(i) B is the most reactive metal.

(ii) If $\mathrm{B}$ is added to a solution of copper (II) sulphate, then it would displace copper and blue colour of $\mathrm{CuSO}_{4}$ will discharge.

$\mathrm{B}+\mathrm{CuSO}_{4}-$ Displacement

(iii) The arrangement of the metals in the order of decreasing reactivity is$B>A>C>D$
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