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Standard VIII

Chemistry

Displacement Reaction

Five 100 ml b...

Question

Five 100ml beakers were taken and labelled a, b, c, d,and e about 50 ml of water was taken in each of the beaker and following substances were added to each of them, left undisturbed for sometime and observations where recorded:

Beaker A :CuSo4+Zn

Beaker B :CuSo4+Fe

Beaker C :ZnSo4+Cu

Beaker D :FeSo4+Cu

Beaker E :ZnSo4+Fe

Write also the relevant chemical equation.

Also write the observation

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Solution

1)
Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4 (aq).
CuSo4 solution is blue. It turns colourless, as Znso4 is colourless. Also, brown precipitate of solid copper is formed.
2)
2 reactions occur.
Most possible one is
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Also,
CuSo₄(aq) + 2 Fe(s) = Fe₂(So₄)₃(aq) + 3Cu(s)

Brown ppt of Cu is formed. Also, solution turns from blue to green as FeSo4 is green.

3) ZnSo4 + Cu -> no reaction.

Copper cannot displace Zn from ZnSO4. So solution remains colourless.

4) FeSO4 + Cu - no reaction. Again, Cu cannot displace iron as iron is more reactive. So, solution remain green.

5) ZnSO4 + Fe - no reaction.
Zn is more reactive than Fe. So, Fe wont displace Zn. Solution remian colorless.

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Similar questions

Five 100ml beakers were taken and labelled a, b, c, d,and e about 50 ml of water was taken in each of the beaker and following substances were added to each of them, left undisturbed for sometime and observations where recorded:

Beaker A :CuSo4+Zn

Beaker B :CuSo4+Fe

Beaker C :ZnSo4+Cu

Beaker D :FeSo4+Cu

Beaker E :ZnSo4+Fe

Write also the relevant chemical equation.

Q. In two beakers (

A

and

B

)

50 m l

water of about

70^{o} C

each is taken. Then in beaker

A

50 m l

of water of about

30^{o} C

is added and after 5 minutes, in beaker

B

50 m l

of water of about

30^{o} C

is added. What would observe if the temperatures of both beakers recorded immediately? Why?

Q. Three beakers labelled as

A, B

and

C

each containing 25 mL of water were taken. A small amount of

N a O H

, anhydrous

C u S O_{4}

and

N a C l

were added to the beakers

A, B

and

C

respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers

A

and

B

, whereas in case of beaker

C

, the temperature of the solution falls. Which one of the following statement(s) is(are) correct ?
(i) In beakers

A

and

B

, exothermic process has occurred.
(ii) In beakers

A

and

B

, endothermic process has occurred.
(iii) In beaker

C

exothermic process has occurred.
(iv) In beaker

C

endothermic process has occurred.

Q. In two beakers (

A

and

B

)

50 m l

water of about

70^{o} C

each is taken. Then in beaker

A, 50 m l

of water of about

30^{o} C

is added and after

5

minutes, in beaker

B, 50 m l

of water about

30^{o} C

is added. What would be observed if the temperature of both beakers are recorded immediately? Why?

Q. A student took three beakers and labelled them as A, B, and C. He added

C u S O_{4}

solution and zinc granules to beaker A, while he added

Z n S O_{4}

solution and copper pieces to beaker B. In beaker C, he added

F e S O_{4}

solution and zinc granules. Select the beakers in which a reaction is expected to be observed.

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