Electrolysis and Chemical Reactions Quiz

Anode is a ……

• positively charged electrode

• negatively charged electrode

• positively charged ion

• negatively charged ion

Cation is a ……

• positively charged electrode

• negatively charged electrode

• positively charged ion

• negatively charged ion

In the electrolysis of dilute sulphuric acid, which equation best describes the process that takes place at the cathode?

• H2 ® 2H+ + 2e-

• 2H+ + 2e- ® H2

• 4OH- ® 2O2 + 2H2O + 4e-

• 2O2- ® O2 + 4e-

In the electrolysis of dilute sulphuric acid, which equation best describes the process that takes place at the anode?

• H2 ® 2H+ + 2e-

• 2H+ + 2e- ® H2

• 4OH- ® 2O2 + 2H2O + 4e-

• 2O2- ® O2 + 4e-

In the electrolysis of brine (a saturated solution of NaCl), the three products are ……

• sodium, chlorine and water

• hydrogen, chlorine and sodium hydroxide

• hydrogen, sodium and chlorine

• sodium, oxygen and chlorine

In the electrolysis of molten NaCl, the two products formed are ……

• sodium and chlorine

• hydrogen and chlorine

• hydrogen and oxygen

• sodium and oxygen

Which word best describes the chemical reaction that takes place when aluminium is extracted from aluminium oxide?

• Decomposition

• Displacement

• Neutralisation

• Oxidation

In the aluminium extraction process, oxygen (oxide) ions move ……

• to the negative electrode because they are negatively charged

• to the negative electrode because they are positively charged

• to the positive electrode because they are negatively charged

• to the positive electrode because they are positively charged

In the aluminium extraction process, aluminium ions move ……

• to the negative electrode because they are negatively charged

• to the negative electrode because they are positively charged

• to the positive electrode because they are negatively charged

• to the positive electrode because they are positively charged

In the electrolysis of aluminium oxide the positive electrode frequently has to be replaced. This is because

• it burns away due to the high temperature and the oxygen that is released

• it is made of cryolite and it dissolves in the molten aluminium ore

• it reacts with impurities in the aluminium ore

• it reacts with the cryolite that the aluminium ore is dissolved in