Question 3

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 Cooper(II) sulphate Zinc sulphate Silver nitrate

A No reaction Displacement

B Displacement No reaction Displacement

C No reaction No reaction No reaction No reaction

Answer

Explanation

A + FeSO₄ → No reaction, because A is less reactive than iron

A + CuSO₄ → Displacement, because A is more reactive than copper

B + FeSO₄ → Displacement, because B is more reactive than iron

B + ZnSO₄ → No reaction, because B is less reactive than zinc

C + FeSO₄ → No reaction, because C is less reactive than iron

C + CuSO₄ → No reaction, because C is less reactive than copper

C + ZnSO₄ → No reaction, because C is less reactive than zinc

C + AgNO₃ → Displacement, because C is more reactive than silver

D + FeSO₄/CuSO₄/ZnSO₄/AgNO₃ → No reaction, because D is less reactive than iron, copper, zinc, and silver

From the above equations, we get:

(i) B is the most reactive metal.

(ii) If B is added to a copper sulphate solution, then it would displace copper from its salt .

B + CuSO₄ → Displacement

(iii) The arrangement of the metals in the order of decreasing reactivity is:

B > A > C > D

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