CBSE Notes, Lectures

CBSE - Chemistry - Metals and Non-metals

Metals and Non-metals

NCERT In Text

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  
C No reaction No reaction No reaction No reaction
D No reaction No reaction No reaction No reaction

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.

Solution:

A + FeSO4 → No reaction, i.e., A is less reactive than iron

A + CuSO4 → Displacement, i.e., A is more reactive than copper

B + FeSO4 → Displacement, i.e., B is more reactive than iron

B + ZnSO4 → No reaction, i.e., B is less reactive than zinc

C + FeSO4 → No reaction, i.e., C is less reactive than iron

C + CuSO4 → No reaction, i.e., C is less reactive than copper

C + ZnSO4 → No reaction, i.e., C is less reactive than zinc

C + AgNO3 → Displacement, i.e., C is more reactive than silver

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

(i) B is most reactive metal.
(ii) B will displace copper from copper sulphate.
(iii) Arrangement of metals in the order of decreasing reactivity B>A>C>D.

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