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Q.

The type of change occurs when coal tar is melted is:

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a

Irreversible change

b

Periodic change

c

Reversible change

d

Natural change

answer is C.

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Detailed Solution

The type of change that occurs when coal tar is melted is a reversible change.
A reversible change is one that can be reversed or undone. These changes are visible in the substance's physical state, size, and shape. A reversible change does not result in the formation of new material. A blacksmith, for example, transforms a piece of iron into various tools. Melting of coal tar on heating is a reversible extrude when you consider that molten coal tar receives cooled and solidifies once more to its black stable shape, Hence we will say that melting of coal tar is a reversible extrude.

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