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B
water gas
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C
laughing gas
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D
coal gas
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Solution
The correct option is A water gas
When steam is passed over hot coke, it produces water gas
Steam is passed over white hot coke(At the high temperature,steam is pass over carbon)
C+H2O=(CO2+H2)
Formed water gas which is colorless poisonous gas that burns with an intensely hot, bluish (nearly colorless) flame. The gas is a mixture of carbon monoxide and hydrogen with very small amounts of other gases, e.g., carbon dioxide, and is almost entirely combustible as a result. Water gas is so named because of the use of water (steam) in its preparation. This process involves treating white-hot hard coal or coke with a blast of steam; carbon monoxide and hydrogen are formed. The gas is manufactured in vast quantities for commercial use. It is of much importance in the preparation of hydrogen and as a fuel in the making of steel and in other industrial processes