Water gas is a mixture of :

Water gas is a synthesis gas (syngas) consisting primarily of carbon monoxide (CO) and hydrogen (H2). It is produced by passing steam over incandescent coke or coal at high temperatures (around 1000°C).

The chemical reaction for its formation is: C + H2O → CO + H2. This process is endothermic, meaning it absorbs heat from the fuel bed.

Key points regarding water gas include:

• It is used as an industrial fuel due to its high calorific value.
• It serves as a crucial source for the industrial production of pure hydrogen and methanol.
• It should not be confused with producer gas, which is a mixture of carbon monoxide and nitrogen (CO + N2).

Thus, Option B is the correct answer as it accurately identifies the chemical composition of water gas.