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Look at figure which shows three situation
 
(a) a burning candle
 
YCIND_211122_4713_1.png
 
(b) an extinguished candle
 
YCIND_211122_4713_2.png
 
(c) melting wax
 
YCIND_211122_4713_3.png
 
Which of these shows a reversible change and why?
 
shows a reversible change. Wax is a substance that, when . On , the molten wax becomes again. So, this is a reversible change.