6th Class Science Changes Around us

  • question_answer 3)
    You have seen that construction workers heat a black material called coal tar, for repairing a road. State whether the change which has occurred in coal tar on being heated is reversible or irreversible?


    When coal tar is heated, it melts to form a thick dark liquid and again it solidifies on cooling. Hence, the melting of coal tar is a reversible change.

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