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प्रश्न
When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D
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उत्तर
A: Coal (mined from the earth)
Coal is mined from the earth.
B: Coke. It consists mainly of carbon.
C: Wood. It is obtained from trees.
D: Charcoal. It consists mainly of carbon.
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