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GS Geography Physical Geography of World
Q.

The highest grade and best quality coal is:
Explanation:

ANS. (D) 
Anthracite is usually considered to be the highest grade of coal and is actually considered to be metamorphic. Compared to other coals it is much harder, has a glassy luster, and is denser and blacker with few impurities. It is largely used for heating domestically as it burns with little smoke.

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