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Water gas is produced by:

1. Passing steam through a red hot coke bed
2. Saturating hydrogen with moisture
3. Mixing oxygen and hydrogen in the ratio of 1:2
4. Heating a mixture of CO2 and CH4 in petroleum refineries

Correct answer: Passing steam through a red hot coke bed

Solution

Water gas is produced by passing steam over red hot coke, which results in a mixture of carbon monoxide (CO) and hydrogen (H2).

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