Paragraph based multiple choice questions:
In order to study the relative activity of metals, four metals, namely, Cu, Ag, Al and Fe and
their salts, namely, CuSO4 ,AgNO3, Al2(SO4)3, and FeSO4 were taken. The salts were dissolved
separately in four beakers. Small amounts of these solutions were taken in four test tubes and a
strip of copper was dipped in each of these four test tubes. Same was repeated for Ag in another
set of four test tubes, and likewise with Al and Fe strips.
Now, answer the following questions choosing the correct option in each case:
a) Which of the following reaction will take place?
i)Ag in CuSO4 solution ii) Cu in FeSO4 solution
iii) Fe in Al2(SO4)3 solution iv) Fe in CuSO4
Answers
Answer:
Procedure:
Select four 100ml beakers and label them as zinc sulphate, copper sulphate, aluminium sulphate and ferrous sulphate.
Add 20ml of 1M solution of ZnSO4, CuSO4, Al2(SO4)3 and FeSO4 in the labeled beaker respectively.
Take a strip of cleaned zinc metal and cut it into small pieces of suitable size.
Add two pieces into each beaker containing CuSO4, Al2(SO4)3 and FeSO4.
Keep the beakers undisturbed for about 1 hour.
After about an hour, note the change in colour of solutions, appearance of metal surface or any other change.
Repeat the similar procedure by adding-
Copper strips to ZnSO4, Al2(SO4)3 and FeSO4 solutions.
Aluminium strips to ZnSO4, CuSO4, and FeSO4 solutions.
Iron strips to ZnSO4, CuSO4 and Al2(SO4)3 solutions.
Simulator Procedure (as performed through the Online Labs)
Select the metal from the ‘Select the metal’ drop down list.
For the solution in beaker A, select it from the ‘Beaker A’ drop down list.
For the solution in beaker B, select it from the ‘Beaker B’ drop down list.
For the solution in beaker C, select it from the ‘Beaker C’ drop down list.
To add metal pieces into the beaker A, drag the forceps over the beaker.
You can click on the inference icon to see the inference.
To add metal pieces into the beaker B, drag the forceps over the beaker.
You can click on the inference icon to see the inference.
To add metal pieces into the beaker C, drag the forceps over the beaker.
You can click on the inference icon to see the inference.
To verify your findings;
Select the metal having the highest reactivity from the ‘Most reactive metal’ drop down list and verify the result.
Select the metal having the lowest reactivity from ‘Least reactive metal’ drop down list and verify the result.
Select the increasing order of reactivity of the metals from ‘Increasing order of reactivity’ drop down list and verify the result.
Click on the ‘Reset’ button to redo the experiment.
Note: Click on the ‘HELP’ button to see the instructions.
Observations:
Metal Salt solution in which added Colour change of solution Appearance of metal surface Inference
Zinc CuSO4 Blue color of CuSO4 disappears and red-brown copper particles settle down at the bottom of the beaker. Changes Zn can displace Cu from CuSO4 solution.
Zn + CuSO4 ---> ZnSO4 + Cu
Al2(SO4)3 Solution remains colorless. No change Zn cannot displace Al from Al2(SO4)3 solution.
FeSO4 Green colour of ferrous sulphate disappears. Iron metal is settling down at the bottom of the beaker. Changes Zn can displace Fe from FeSO4 solution.
Zn + FeSO4 ---> ZnSO4 + Fe
Copper ZnSO4 Solution remains colorless. No change Cu cannot displace Zn from ZnSO4 solution.
Al2(SO4)3 Solution remains colorless. No change Cu cannot displace Al from Al2(SO4)3 solution.
FeSO4 Solution remains colorless. No change Cu cannot displace Fe from FeSO4 solution.
Aluminium ZnSO4 Solution remains colorless. Zinc metal is settling down at the bottom of the beaker. Changes Al can displace Zn from ZnSO4 solution.
2Al + 3ZnSO4 ---> 3Zn + Al2(SO4)3
CuSO4 Blue colour of CuSO4 disappears. The brown colored copper particles settle down at the bottom of the beaker.