Assertion: If an iron nail is put in a blue copper sulphate solution, its colour changes to green.
Reason: The reactivity of copper is greater than that of iron and hence the change in colour
1
Both assertion and reason are correct and reason is the correct explanation of the assertion
2
Both assertion and reason are correct but reason is not the correct explanation of the assertion
3
Assertion is true but reason is false
4
Assertion is false but reason is true