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MDCAT Chemistry QUESTION #4377
Question 1
Which of the following situations most clearly demonstrates a key characteristic of a redox reaction?
  • Water boiling to steam
  • Hydrogen gas reacting with chlorine to form hydrogen chloride gas✔️
  • Sodium chloride dissolving in water
  • Ethanol evaporating at room temperature
Correct Answer Explanation
$H_2 + Cl_2 \rightarrow 2HCl$: Hydrogen is oxidized ($0 \rightarrow +1$) and chlorine is reduced ($0 \rightarrow -1$). This is a clear redox reaction involving electron transfer.