A copper coin is dipped in a solution of silver nitrate for some time. Which observation is expected?
Correct: C
This is a displacement reaction. Copper is more reactive than silver (Cu > Ag) in the reactivity series. Therefore, copper will displace silver from its salt solution.
Cu(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s)
As a result, silver metal will be deposited on the copper coin (often appearing as a shiny white coating), and the solution, initially colorless (silver nitrate), will turn blue due to the formation of copper(II) nitrate.