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Formation of Precipitate

When iron fil...

Question

When iron filings are added to copper sulphate solution, a confirms the occurrence of a chemical change.

A

change in colour

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B

evolution of gas

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C

evolution of heat

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Solution

The correct option is A change in colour
The copper sulphate solution is blue in colour. When iron reacts with it, the solution gradually obtains green colour due to the formation of ferrous sulphate. This can be represented as:

Iron + Copper sulphate $\to$ Ferrous sulphate + Copper

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