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8th Class Science Coal and Petroleum Question Bank Coal and Petroleum Summative Subjective Problems

  • question_answer
    What is coaltar? What are its uses?

    Answer:

    Coaltar is a black thick liquid. It is a mixture of about 200 substances. Uses: (i) It is used a source of various useful substances. (ii) It is used to get naphthaline which is used to repel moths and other insects. (iii) It is used to make road surface.


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