Q) during an experiment a student observed that the blue colour of copper sulphate solution changed to pale green by immersing a metallic rod for sometime --
a) what metallic rod the student might have immersed in the solution and what colour would be observed on the rod?
b) mention the type of reaction in this case.

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Solution

A) The type of rod is probably a zinc rod and the color of the rod will change to Orangish brown.
b)The reaction is a displacement reaction

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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

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A) The type of rod is probably a zinc rod and the color of the rod will change to Orangish brown. b)The reaction is a displacement reaction

A) The type of rod is probably a zinc rod and the color of the rod will change to Orangish brown.
b)The reaction is a displacement reaction