AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The four types of coal in increasing order of carbon content and quality are: Peat → Lignite → Bituminous → Anthracite.
The passage clearly lists coal types from lowest to highest grade. Examiners expect all four names in the correct sequence. "Peat" (lowest carbon, high moisture) to "Anthracite" (highest quality hard coal) is the key order to remember. Writing just the names in order is sufficient for 1 mark.