When iron filings are added to copper sulphate solution, a confirms the occurrence of a chemical change.
A
evolution of gas
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B
evolution of heat
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C
change in colour
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Solution
The correct option is C 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 → Ferrous sulphate + Copper