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Q.

Iron fillings were added to an aqueous solution of Copper sulphate. After some time, on observation it was found that the colour of the solution had changed from

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a

Blue to pale green

b

Blue to dark green

c

Blue to colourless

d

Blue to reddish brown

answer is A.

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Detailed Solution

A displacement reaction takes place when more reactive element can displace the less reactive element.
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