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Option 2 : Ag

Concept:

A metal of high reactivity displaces a metal of low reactivity from its salt solution.

The reactivity of metal is decided by its reactivity series.

Reactivity series:

K > Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > H > Cu > Hg > Ag > Au.

Application:

Since Mg, Zn, Cu are more reactive than Silver Ag, they can replace silver from its salt solution.
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