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Question 34

During water-gas shift reaction

Solution

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The water-gas shift reaction is:

$$CO + H_2O \to CO_2 + H_2$$

In this reaction:

  • Carbon monoxide (CO) is oxidized to carbon dioxide (CO₂) — carbon's oxidation state changes from +2 to +4
  • Water (H₂O) is reduced — hydrogen is reduced from +1 to 0 (H₂)

This matches option 1: Carbon monoxide is oxidized to carbon dioxide.

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