The electrons are transferred in the given redox reaction are 2 electrons.
When oxidation and reduction that is gaining of electron and loosing of electrons takes place simultaneously in a chemical reaction then it would be known as redox reaction.
In terms of oxygen the gaining of oxygen is oxidation and loosing of oxygen is reduction.
In the given chemical reaction the transfer of two electrons will be as follows
Zn₂ (2e) + AgNo₃ → 2Ag (2e) + Zn(NO₃)₂
It is clear from the reaction their is transfer of two electrons zinc is loosing 2 electrons undergoes to oxidation while silver gets reduced.
Therefore, transfer of only two electrons.
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