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MDCAT Chemistry QUESTION #4356
Question 1
Oxidation numbers of X, Y, Z are $+6$, $-2$, $\&$ $-1$ respectively. Possible molecular formula when atoms combine:
  • $X_2YZ$
  • $XY_2Z_2$✔️
  • $XYZ_2$
  • $XY_2Z$
Correct Answer Explanation
For electrical neutrality, the sum of oxidation numbers must equal zero. For $XY_2Z_2$: $(+6) + 2(-2) + 2(-1) = +6 - 4 - 2 = 0$ ✓. This is the correct formula.