Science
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 :
| Metal | Iron (II) sulphate | Copper (II) sulphate | Zinc sulphate | Silver nitrate |
|---|---|---|---|---|
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the table given 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.
Metals & Non-Metals
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Answer
(i) B is showing displacement reaction with iron (II) sulphate and no reaction with silver nitrate, hence, the metal lies above iron and below zinc. As we know metals at the top of the metal reactivity series are most reactive, therefore, B is the most reactive metal.
(ii) When B is added to a solution of copper (II) sulphate, displacement reaction will take place. Blue colour of copper sulphate will fade and reddish brown copper will settle down.
(iii) The decreasing order of reactivity is:
B > A > C > D
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