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Q.

Is it true that the melting of coal tar used for making roads is an irreversible change?


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a

True

b

False  

answer is B.

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Detailed Solution

The above statement is false.
Reversible changes are those changes which can be brought back to their original form. For example, construction workers use coal tar for repairing roads. Coal tar melts when heated, and the same molten coal tar solidifies on cooling. So, the melting of coal tar is a reversible change.
The correct statement would be that melting coal tar for making roads is a reversible change.
 
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Is it true that the melting of coal tar used for making roads is an irreversible change?