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Uses of Metals

Aluminium pow...

Question

Aluminium powder was added to a solution of copper sulphate. The colour of the solution changed from :

A

Colourless to blue

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B

Blue to colourless

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C

Light green to blue

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D

Reddish brown to light green

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Solution

The correct option is A Blue to colourless
Aluminium is above of copper in metal reactivity series hence Cu is replaced by Al, so solution color changes from blue to colorless.

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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

Q. You have 3 metals and salt solutions of these metals. Test
tube Solution

A	Magnesium sulphate
B	Copper sulphate
C	Ferrous sulphate

HINT: (Magnesium sulphate -white colour, copper sulphate -blue colour, Ferrous sulphate- green colour )
When you were away, your younger brother added a metal in a blue coloured solution to make it green. Which of the following could have happened?

In adding dilute HCl to copper oxide powder, the solution formed is blue-green. Identify the compound formed which gives blue green colour solution?

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