The usefulness of given sample of coal is determined by:Select one:a.Proximate Analysisb.Salt analysisc.Volumetric analysisd.Gas analysis

The usefulness of a given sample of coal is determined by:

a. Proximate Analysis

Proximate analysis is the most common method used to determine the quality of coal. It includes the determination of carbon, moisture, ash, and volatile matter content. The results of proximate analysis can provide information about the energy content and the behavior of coal when it is burned.

b. Salt analysis

Salt analysis is not typically used to determine the usefulness of coal. It is more commonly used in the analysis of water or soil samples.

c. Volumetric analysis

Volumetric analysis, also known as titrimetry, is a common laboratory method in analytical chemistry. However, it is not typically used to determine the usefulness of coal.

d. Gas analysis

Gas analysis can be used to determine the gaseous components of coal, such as methane and other hydrocarbons. This can provide information about the potential for coal bed methane extraction. However, it does not provide a comprehensive assessment of the usefulness of coal.

Therefore, the correct answer is a. Proximate Analysis.