CBSE Class 10 Science 2015 Term I Set 2

Question : 9

Total: 36

You are given samples of three metalssodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivity.

Solution:

Given three metals-sodium (Na), magnesium (Mg), copper (Cu)
Activity I. When the three given metals Na, Mg and Cu are added to magnesium chloride solution separately taken in three different test tubes, we will find that displacement reactions will take place in the following manner:

MgCl2 solution	Metals
Displacement reaction	Na
No reaction	Mg
No reaction	Cu

This shows that Na is the most reactive metal as it displaces Mg from MgCl2 solution.
Activity II. When Na,Mg and Cu metals are taken in three different test tubes and CuSO solution is added in each test tube, we will find that displacement reactions will take place in the following manner:

CuSO4 solution	Metals
Displacement reaction	Na
Displacement reaction	Mg
No reaction	Cu

This shows that Cu is the least reactive metal. Order of decreasing reactivity: Na>Mg> Cu.

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