Question

A standard galvanic cell is constructed in which a Cu2+ | Cu half cell acts as the cathode. Which of the following statements are correct? Hint: Refer to a table of standard reduction potentials. (Choose all that apply.) Cu2+ is reduced at the cathode. As the cell runs, anions will migrate from the Cu2-jCu+ compartment to the other compartment. □ The cathode reaction is Cu2+ + e--> Cu- anions will migrate siom the CuiCu other compartment The cathode reaction is Cu+-> Cu2+ + e- The anode compartment could be Br2Br.

Answer 1

As Cu²⁺/Cu⁺ acts as a cathode in an electrochemical cell.

So we know that at cathode reduction takes place which is given as

Cu²⁺(aq) + e^- ---> Cu⁺(aq)

so we can clearly see that Cu²⁺ is reduced to Cu⁺ at cathode.

As we can clearly see that at cathode reduction takes place so charge is becoming less so it is not possible for anions to migrate to cathode making it unstable rather cations should migrate towards cathode as the cell runs.

From standard reduction table we can see that E^o_Cu2+/cu+ =-0.18 V while E^o_Br2/Br- =1.07 V

So we can easily see that reduction potential of Br₂ is more than that of Cu²⁺ so Br₂ should form cathodic compartment while Cu²⁺ as anodic cmpartment.