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0. Assertion (A): When we dip iron nail into CuS04 solution the colour of solutions changes. Reason (B) : Copper is less reactive than iron (NTSE Punjab, Stage-I, 2016-17)
Both A and R are correct but R is not correct reason for A
Both A and R are correct, R is correct reason for A
A is correct and R is incorrect
A is incorrect and R is correct
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