A hard coal containing little volatile matter is called ———- - सख्त कोयला‚ जो थोड़ा वाष्पशील पदार्थ युक्त है‚ उसे– —कहा जाता है।

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A hard coal containing little volatile matter is called ———- - सख्त कोयला‚ जो थोड़ा वाष्पशील पदार्थ युक्त है‚ उसे– —कहा जाता है।