A black material (tar) is heated for repairing a road. Whether the change caused in tar, by
heating can be reversed?
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Coal tar is a black, solid material which is used in making and repairing roads. Whencoal tar is heated, it melts to form a thick black liquid. The melting of coal tar on heating, is a reversible change because when hot, molten coal tar gets cooled, it solidifies again.
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