[[1]] is the most popular coal for commercial use.

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Detailed Solution

Bituminous coal is the most suitable for commercial usage due to its calorific value, volatility, and ash concentration. Bituminous, or black charcoal, is a type of coal that contains tar-like substances called bitumen or asphalt. Its colour can be black or sometimes dark brown. Often, the seams have well-defined light and matte material stripes. It's usually hard but brittle. Bituminous coal is used for power generation and is an important fuel and raw material for the production of coking coal and the steel industry. Bituminous is the most popular coal type for commercial purposes since it has 60 to 80% of carbon content. Bituminous coal is a lump of relatively soft coal that contains a tar-like substance called bituminous.

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