MCAT General Chemistry Question 156: Answer and Explanation

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Question: 156

6. Which of the following is the correct net ionic reaction for the reaction of copper with silver(I) nitrate?

  • A. Cu + AgNO3 → Cu(NO3)2 + Ag
  • B. Cu + 2 Ag+ + NO3- → Cu2+ + 2 NO3- + 2 Ag+
  • C. 2 Ag+ + 2 NO3- → 2 NO3- + 2 Ag+
  • D. Cu + 2 Ag+ → Cu2+ + 2 Ag

Correct Answer: D

Explanation:

A net ionic equation represents each of the aqueous ions comprising the reactants and products as individual ions, instead of combining them as formula units. Thus, Choice (A) is not a net ionic reaction. The term net means that the correct answer does not include any spectator ions (ions that do not participate in the reaction). In this reaction, nitrate (NO3-) remains unchanged. Therefore, choices (B) and (C) are eliminated.

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