Which of the following statements is true?
The cathode is the positive electrode which attracts anions to it.
The anode is the positive electrode which attracts cations to it.
The cathode is the negative electrode which attracts cations to it.
Which of the following statements is false?
Reduction occurs at the anode.
The positive electrode attracts negative ions.
Oxidation occurs at the anode.
In the electrolysis of molten lead(II) bromide using graphite electrodes:
Lead forms at the cathode and bromine forms at the anode.
Bromine forms at the cathode and lead forms at the anode.
Hydrogen forms at the cathode and bromine forms at the anode.
In the electrolysis of molten aluminium oxide, the electrodes are made from:
Aluminium
Steel
Carbon
The ore from which aluminium oxide is obtained is called
Haematite.
Magnetite.
Bauxite.
Which of the following half equations occurs at the anode in the electrolysis of aluminium oxide?
Al3+ + 3e- → Al
2O2- → O2 + 4e-
O2- → O + 2e-
Which of the following statements summarises the observations during the electrolysis of molten lead(II) bromide using graphite electrodes?
Grey liquid forms at the cathode and green vapour forms at the anode.
Grey liquid forms at the cathode and red-brown vapour forms at the anode.
Grey liquid forms at the cathode and purple vapour forms at the anode.
During the electrolysis of dilute sulfuric acid which of the following is correct?
Oxygen is produced at the cathode and hydrogen at the anode.
Hydrogen is produced at the cathode and oxygen at the anode.
The volume of oxygen produced is twice the volume of hydrogen.
Which of the following statements about electrolysis is incorrect?
The positive electrode is the cathode.
The negative electrode is the cathode.
The positive electrode is the anode.