Look at figure 6.1 which shows three situations
(a) a burning candle
(b) an extinguished candle
(c) melting wax.
![](/assets/questions/media/ncert-exemplar-solutions-for-class-6-science-chapter-6-image-1.png)
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The melting of wax in figure (c) is a reversible change because the molten wax can be solidified again.
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