MCAT General Chemistry Question 296: Answer and Explanation

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Question: 296

3. Which of the following substances has the atom with the greatest oxidation state?

  • A. CH2F2
  • B. K2O
  • C. S4O62--
  • D. Fe2O3

Correct Answer: D

Explanation:

D Assigning oxidation states yields:

CH2F2: F = -1, H = 0, C = –2;

K2O: K = +1, O = -2;

S4O62-: O = -2, S = average of +2.5;

Fe2O3: O = -2, Fe = +3;

Since +3 is the greatest number, choice D is the best answer.

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