// You may have noticed that road construction workers heat a black material, i.e., tar for repairing a road. Can the change caused in tar, by heating, be reversed?
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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? Answer: ... Hence, the melting of coal tar is a reversible change.
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