$2.$The Frasch process for extracting sulphur from underground deposits primarily utilizes which of the following to melt the sulphur?

A$)$ Compressed air

B$)$ Superheated water

C$)$ Liquid nitrogen

D$)$ Carbon dioxide

Manufacture of Hydrochloric Acid $($Extended$)$

Hydrochloric acid can be produced as a byproduct of which process?

A$)$ The Ostwald process for nitric acid production

B$)$ The Haber process for ammonia synthesis

C$)$ The chlor$-$alkali process

D$)$ The Solvay process for sodium carbonate production

NATURAL PRODUCTS PROCESSING: Gasification of Coal and Chemicals from Coal $($Extended$)$

The main advantage of coal gasification over direct coal combustion is:

A$)$ Lower carbon dioxide emissions

B$)$ Higher energy efficiency

C$)$ Easier storage and transportation of coal

D$)$ Lower sulfur emissions

A critical chemical produced from coal that is used in the manufacture of synthetic rubber is:

A$)$ Methanol

B$)$ Ammonia

C$)$ Ethylene

D$)$ Butadiene