Four pieces of magnesium, gold, chromium, and copper are put in beakers of silver sulphate, aluminum nitrate, calcium chloride, iron sulphate respectively. Answer the following questions based on this activity:

a. In which of the beakers color change and displacement occur?

b. Give reason for each reaction?

c. Arrange the metal pieces in the decreasing order of reactivity.

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Solution

Dear Student

a) Colour change and displacement will takes place in silver sulphate beaker since magnesium is placed above silver in reactivity series so magnesium will displace Ag and will form Magnesium sulphate (White) so colour changes from black ( AgSO₄) to white (MgSO₄)

b) Reaction is only possible in case of ist case which is shown below , reaction in other cases not possible because according to the reactivity series of the metal all metals other than Magnesium will not be able to displace the metals in their respective beaker owing to their low reactivity.

Mg + AgSO₄---> MgSO₄ + Ag

c) Metal pieces in decreasing order of their reactivity are as follows :
Magnesium > Copper> Chromium > Gold

Regards

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Q. Beakers

A, B

and

C

contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. The blue colour will appear in case of:

Q. Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour appears in the case of ___.

Q. Four metals A, B, C and D are, in turn, added to the following solutions one by one. The observations made are tabulated below:

Metal	Iron (II) sulphate	Copper (II) sulphate	Zinc sulphate	Silver nitrate
A	No reaction	Displacement	-	-
B	Displacement	-	No reaction	-
C	No reaction	No reaction	No reaction	Displacement
D	No reaction	No reaction	No reaction	No reaction

Answer the following questions based on above information:
(i) Which is the most active metal and why?
(ii) What would be observed if B is added to a solution of copper (II) sulphate and why?
(iii) Arrange the metals A, B, C and D in order of increasing reactivity.
(iv) Container of which metal can be used to store both zinc sulphate solution and silver nitrate solution. Give reason for your choice.
(v) Which of the above solutions can be easily stored in a computer made up of any of these metals?

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	Displacement
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.

A solution of copper sulphate, zinc sulphate, lead sulphate and silver nitrate of same concentration are taken in beakers. A zinc rod is dipped in each solution separately. In which beaker(s) will you observe the displacement reaction?

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