MCAT General Chemistry Question 295: Answer and Explanation

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Question: 295

2. Which of the following correctly describes the relationship between the movement of electrons and K+ ions?

  • A. K+ ions and electrons both travel towards Beaker X.
  • B. K+ ions travel towards Beaker X and electrons travel towards Beaker Y.
  • C. K+ ions travel towards Beaker Y and electrons travel towards Beaker X.
  • D. K+ ions and electrons both travel towards Beaker Y.

Correct Answer: D

Explanation:

D No matter the type of cell, electrons always flow from anode to cathode. Also, oxidation always occurs at the anode and reduction always occurs at the cathode. In the concentration cell in the passage, [Cu2+] will increase in Beaker X and decrease in Beaker Y until they equalize. Therefore, oxidation occurs in Beaker X and reduction occurs in Beaker Y. Electrons flow from X to Y, and K+ ions follow the electrons to minimize the charge build-up in Beaker Y.

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