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The equation that represents the water-gas shift reaction is:

1. CO(g) + H2O(g) 673K Catalyst CO2(g) + H2(g)
2. CH4(g) + H2O(g) 1270K Ni CO(g) + 3 H2(g)
3. C(s) + H2O(g) 1270K CO(g) + H2(g)
4. 2C(s) + O2(g) + 4N2(g) 1273K 2CO(g) + 4N2(g)

Correct answer: CO(g) + H2O(g) 673K Catalyst CO2(g) + H2(g)

Solution

The correct option accurately represents the water-gas shift reaction, where carbon monoxide reacts with water vapor to produce carbon dioxide and hydrogen gas, typically at elevated temperatures and in the presence of a catalyst.

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