Exercise - ELECTROCHEMISTRY
i. Which of the following statements is not correct about the galvanic cell?
- a) Cations are reduced at the cathode
- b) Anions are oxidized at the anode
- c) Electrons flow from cathode to anode
- d) Oxidation occurs at the anode
ii. Which of the following is not true about the Daniel cell
- a) Half-cell of an active metal acts as a cathode.
- b) Half-cell contains an element in contact with its ions in aqueous solution.
- c) A salt bridge connects the two half-cells.
- d) A spontaneous oxidation-reduction reaction generates electricity.
iii. Which of the following does not involve an electrolytic process?
- a) Refining of copper
- b) Manufacture of sodium from NaCl
- c) Electroplating of steel
- d) Reduction of metal oxide by a reducing agent.
iv. Galvanizing is
- a) Coating with Sn
- b) Coating with Zn
- c) Coating with Cr
- d) Coating with Cu
v. Which of the following is true for the Nelson cell?
- a) Sodium metal is produced at the anode
- b) Chlorine gas is produced at anode
- c) Hydrogen gas is produced at the anode
- d) Sodium ions are not reduced at the cathode
vi. Electroplating involves:
- a) Using an electrolyte to oxidize a metal.
- b) Coating a metal object with a thin layer of metal through electrolysis.
- c) Melting a metal object to form a thin coating.
- d) Using heat to form a layer of metal on another metal object
vii. In a voltaic cell, the salt bridge serves the function of:
- a) Preventing electrons from flowing in the external circuit.
- b) Maintaining electrical neutrality by allowing ion movement.
- c) Storing excess energy from the cell.
- d) Generating additional voltage for the cell.
viii. If the voltage data shows metal A has a higher standard reduction potential than metal B, it can be concluded that:
- a) Metal A is more reactive than metal B.
- b) Metal B is more reactive than metal A.
- c) Metal A and metal B have the same reactivity.
- d) Metal A is less likely to gain electrons than metal B