Consider the following substances: [Miscellaneous]

I. Ethanol

II. Nitroglycerine

III. Urea

Coal gasification technology can be used in the production of how many of them?

The correct option is Only two.

Coal gasification is a process that converts coal into synthesis gas (syngas), which is a mixture consisting primarily of carbon monoxide (CO), hydrogen (H₂), and carbon dioxide (CO₂). This syngas serves as a fundamental chemical building block to produce a wide range of fertilizers, fuels, and other chemicals. Let us analyze each of the given substances:

I. Ethanol:
Syngas produced from coal gasification can be converted into methanol (CH₃OH), which can be further processed into ethanol (C₂H₅OH). Alternatively, syngas can be directly converted into ethanol through catalytic synthesis or syngas fermentation by microbes. Thus, coal gasification technology can be used in the production of ethanol.

II. Nitroglycerine:
Nitroglycerine is an explosive chemical produced by nitrating glycerol using concentrated nitric acid and sulfuric acid. Glycerol is typically sourced from natural fats/oils or as a byproduct of biodiesel production. Coal gasification is not utilized in the commercial production of nitroglycerine.

III. Urea:
Urea (NH₂CONH₂) is synthesized industrially from ammonia (NH₃) and carbon dioxide (CO₂). The hydrogen gas (H₂) required to synthesize ammonia is majorly sourced from syngas produced during coal gasification, and carbon dioxide is also a direct byproduct of the gasification process. Thus, coal gasification technology is heavily used in the production of urea.

In conclusion, coal gasification can be used to produce only ethanol and urea (a total of two of the three substances listed).