zia added a few zinc granules to ferrous sulphate solution and recorded his observations . which of the following are correct? "a) pale green colour of solution turns black.
b) pale green solution of colour of solution disappears and becomes colourless.
c) pale green solution turn blue
d) pale green colour solution disappears, black deposits are seen on granules

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Solution

Ferrous sulphate solution is green in colour. So, when zinc is added to ferrous sulphate solution its green colour will fade away. This happens because zinc is more reactive than iron, and so displaces iron from its salt forming zinc sulphate and iron metal instead. Following is the chemical equation for the reaction

Zn (s) + FeSO₄ (aq) → ZnSO₄ (aq) + Fe (s)

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A student took four test tubes containing solutions of different colours marked I (colourless) II(Blue), III (Orange) and IV (Pale green) .
Which of the tubes contain copper sulphate solution and ferrous
sulphate solution?

Q. A piece of granulated zinc was dropped into copper sulphate solution. After some time, the colour of the solution changed from :
(1) light green to blue
(2) blue to colourless
(3) light green to colourless
(4) bule to yellow

The colours of aqueous solutions of CuSO₄ and FeSO₄ as observed in the laboratory are:

Select the correct answers :

(a) Colour of an aqueous solution of copper sulphate is

(i) Green (ii) Brown (iii) Blue (iv) Yellow

(b) Colour of the precipitate formed on adding $N a O H$ solution to iron (II) sulphate solution is

(i) White (ii) Brown (iii) Green (iv) Pale blue

(i) Iron (ii) Magnesium (iii) Zinc (iv) Copper

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

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