CBSE Class 10 Science 2015 Term I Set 2

Question : 9 of 36

Marks: +1, -0

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:

${\MgCl}_2$ 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

{\MgCl}_2

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:

${\CuSO}_4$ 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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