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  4. Assertion: When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution. Reason: Copper cannot displace silver from its salt solution.

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Q. Assertion : When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution.
Reason : Copper cannot displace silver from its salt solution.

Electrochemistry

Solution:

When a copper wire is dipped in silver nitrate solution it turns blue. $Cu$ is more reactive than $Ag$ hence displaces silver from its salt solution.