Question

The following pair of half-reactions occurs in an electrochemical cell.

Ag+ + e- ---> Ag
H2S ---> S + 2H+ + 2e-
Where does the silver half-reaction take place?

at the cathode

in the salt bridge

on the wire

at the anode

Answer 1

Answer: The silver half reaction occurs at the cathode.

Explanation: In a cell, there exists two electrodes: anode and cathode.

Anode is an electrode at which oxidation reaction occurs which meas that loss of electrons occur at this electrode.

Cathode is the electrode at which reduction reaction occurs which means that the gain of electrons occur at this electrode.

In the give electrochemical cell, the silver half reaction follows:

`Ag^++e^-\rightarrow Ag`

This is a type of reduction reaction because
`Ag^+` is gaining one electron to form Ag.

Hence, it will takes place at the cathode.