Preferential Discharge

The preferential discharge of the ions depends on its position in the ____________ series.

Which is the correct electrochemical series?

• Na, Al, Fe, Mg, Zn

• Mg, Fe, Zn, Na, Al

• Na, Mg, Al, Zn, Fe

• Fe, Zn, Na, Mg, Al

In the process of electrolysis, the ions are discharged as ______ _____ at the respective electrodes.

In an aqueous solution of copper chloride, which substance is produced at the positive electrode

• copper
• chlorine
• oxygen
• ^chloride 

What happens at the positive electrode?

• Positive non-metal ions are attracted
• Positive metal ions are attracted
• Negative non-metal ions are attracted
• Negative metal ions are attracted

Positive ions (cations) will move towards the cathode (-) where they will discharge by....

• Breaking apart
• Losing electrons
• Clumping together.
• Gaining electrons

What is the equation to show what happens to Cl ions at the anode.

• Cl^- --> Cl + e-   
• 2Cl^- --> Cl₂ + 2e-   
• Cl₂ + 2e-   2Cl^- 
• Cl₂ + 2e-  _-->  2Cl^- 

Choose the half-equation that shows the discharge of aluminium ion.

• Al³⁺ - 3e^- --> Al

• Al²⁺ + 3e^- --> Al

• Al³⁺ + 3e^- --> Al

• Al³⁺ --> Al + 3e^-

What is the half-equation for the discharge of hydroxide ions?

• 2O^2- --> O₂ + 4e^-

• OH^- --> OH + e

• 4OH^- --> 2H₂O + O₂ + 4e^-

• 2H₂O + O₂ + 4e^- --> 4OH^-

Anions get discharged by ________ electrons at the ___________

• gaining, cathode

• losing, anode

• gaining, anode

• losing, cathode