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The residue of coal decomposition that is used in the manufacture of steel is called: 1. coal gas 2. coke 3. coal tar

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The correct answer from the choices given is option 3. Coal tar is the residue of coal decomposition that is used in the manufacture of steel. It is a brown to black liquid with very high viscosity. It is a by-product when coal is carbonized or gasified. This substance contains a mixture of many substances.
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