Answer: zero.
- A large and positive
- B zero
- C large and negative
- D equal to one
Correct answer: B. zero
Explanation: Both electrodes are identical in a concentration cell, so E°cell = 0 and the EMF arises only from the concentration difference.
In a Daniell cell, electrons flow externally from the zinc anode (oxidation) through the voltmeter to the copper cathode (reduction), while the salt bridge completes the circuit.
Concept context
Explore the link between chemical reactions and electricity. Covers galvanic cells, electrolysis, standard electrode potentials, the Nernst equation, and real-world applications like batteries and corrosion.