Aqueous solutions of zinc sulphate and iron sulphate were taken in the test tubes I and II by four students- A- B- C and D- Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours and recorded in the form of a table as given below-Observation by 1-c- Metal Solution Colour change of solution Deposit-Residue obtained 2- A Fe ZnSO 4 turned green silvery grey coating 2 - 5 Zn FeSO 4 no change no change 2- B Fe ZnSO 4 no change black residue 2 - 5 Zn FeSO 4 colour faded grey coating 2- C Fe ZnSO 4 no change no change 2 - 5 Zn FeSO 4 turned colourless black residue 2- D Fe ZnSO 4 no change grey residue 2 - 5 Zn FeSO 4 no change black residue The correct reporting has been made observations reported by the student -1 A2 B3 C4 D

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Chemical Properties of Metals and Non-metals

Aqueous solut...

Question

Aqueous solutions of zinc sulphate and iron sulphate were taken in the test tubes I and II by four students. A, B, C and D. Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours and recorded in the form of a table as given below:

Observation by Metal Solution Colour change of solution Deposit/Residue obtained

A Fe ZnSO₄ turned green silvery grey coating

Zn FeSO₄ no change no change

B Fe ZnSO₄ no change black residue

Zn FeSO₄ colour faded grey coating

C Fe ZnSO₄ no change no change

Zn FeSO₄ turned colourless black residue

D Fe ZnSO₄ no change grey residue

Zn FeSO₄ no change black residue

The correct reporting has been made observations reported by the student :
(1) A
(2) B
(3) C
(4) D

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Solution

When iron is treated with zinc sulfate, no reaction takes place because iron is less reactive than zinc.
When zinc is treated with iron sulphate, the green colour solution becomes colourless and black residue of iron is obtained.
So observations made by student C are correct.

Hence, the correct answer is option 3.

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Similar questions

Q. Four students A, B, C and D took aqueous solutions of zinc sulphate and iron sulphate in two test tubes I and II and dropped metal pieces of Iron and Zinc in the two solutions. After several hours, they made observations and recorded their findings in the form of a table given below:

Observation	Metal	Solution	Change in colour of the solution	Deposit/Residue obtained
By A	Fe	ZnSO $_{4}$	turned green	Silver grey coating
	Zn	FeSO $_{4}$	no change	no change
By B	Fe	ZnSO $_{4}$	no change	black residue
	Zn	FeSO $_{4}$	colour faded	grey coating
By C	Fe	ZnSO $_{4}$	no change	no change
	Zn	FeSO $_{4}$	turned colourless	black residue
By D	Fe	ZnSO $_{4}$	no change	grey residue
	Zn	FeSO $_{4}$	no change	black reside

Who reported the correct observation?

Q. Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.

Student	Aluminium sulphate solution (I)	Copper sulphate solution (II)
A	Colourless changes to light green	Blue colour of the solution is retained
B	Colour of colourless solution does not change	Blue colour of the solution changes to light green
C	Colourless solution changes to light blue	Blue colour of the solution changes to colourless
D	Colour of colourless solution remains unchanged	Blue colour of the solution fades away

The correct set of observations have been recorded by the students :
(1) A
(2) B
(3) C
(4) D

A more reactive metal displaces a less reactive metal from the aqueous solution. From the following set tell which one represents a correct picture, of both the possible (√) reaction and impossible (x) reactions between metals and the solution of different salts.

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?

Q. Identify the following solutions, whether they are acid or alkali.

Solution	Change in Indicator			Acid/Alkali
	Litmus	Phenolphthalein	Methyl orange
1.	...	No change	...
2.	...	...	Orange colur turns red
3.	Red litmus turns blue	...	...

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Observation by	Metal	Solution	Colour change of solution	Deposit/Residue obtained
A	Fe	ZnSO₄	turned green	silvery grey coating
A	Zn	FeSO₄	no change	no change
B	Fe	ZnSO₄	no change	black residue
B	Zn	FeSO₄	colour faded	grey coating
C	Fe	ZnSO₄	no change	no change
C	Zn	FeSO₄	turned colourless	black residue
D	Fe	ZnSO₄	no change	grey residue
D	Zn	FeSO₄	no change	black residue