Question

A strip of copper is placed in four different colourless salt solutions. They are KNO3, AgNO3, Zn(NO3)2, Ca(NO3)2. Which one of the solutions will finally turn blue.

August 10, 2024

Answer

Silver Nitrate (AgNO₃)

Reason — Copper displaces silver from AgNO₃ soln. forming the blue copper [II] nitrate soln.

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