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Water gas is

  • A.H\(_{2}\)O (steam)
  • B.CO + H\(_{2}\)
  • C.CO + H\(_{2}\)O
  • D.CO\(_{2}\) + H\(_{2}\)

Answer: B

Water gas is CO + H2.

It is made by passing steam over red-hot coke:

\[ \mathrm{C + H_{2}O \rightarrow CO + H_{2}} \]

The mixture of carbon monoxide and hydrogen (also called synthesis gas) is a fuel and a starting material for making methanol and hydrogen. CO + H2O are the reactants of the water-gas shift reaction, whose products are CO2 + H2; steam alone is the reactant, not the gas.

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