Final answer:
The false statement regarding electrochemistry is e. In a concentration cell, electrons do not flow from the higher to lower concentration half-cell; rather, they flow from the anode to the cathode based on a potential difference created by a concentration gradient.
Step-by-step explanation:
To determine the false statement regarding electrochemistry, let's evaluate each provided statement:
- a. The purpose of an inert electrode is to facilitate the transfer of electrons. - This statement is true as inert electrodes serve as a surface for a redox reaction without participating in the reaction chemically.
- b. Electrons travel towards the cathode in a galvanic cell. - This is also true; in galvanic cells, electrons move from the anode to the cathode through an external circuit.
- c. Eanode must always be lower than Ecathode in a spontaneous electrochemical cell. - This is a true statement because for a spontaneous reaction to occur, the potential at the cathode must be higher than that at the anode.
- d. During electrolysis, electricity is needed to drive a non-spontaneous redox reaction. - Another true statement, as electrolysis involves using an external voltage to cause a non-spontaneous reaction.
- e. In a concentration cell, electrons flow from the higher to lower concentration half-cell. - This is the false statement. Electrons actually flow from the anode (higher concentration of metal ions) to the cathode (lower concentration of metal ions) in a concentration cell, not based on the concentration of the half-cell solutions but based on the potential difference driven by the concentration gradient.