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Q.

During Diwali, Rani saw her mom lighting a candle and then collected the melted wax. Which of the following statements is correct, if Rani observed the candle?  

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a

Burning of candle is a reversible change since we can reuse the candle.  

b

Burning of candle produces heat which can be stored.  

c

Wax gets harder as the temperature is increased.  

d

Burning of candle is not generally reversible.  

answer is A.

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Detailed Solution

Burning of candle is perfect example for a reversible change around us to observe, since there is only change of state of wax during different temperatures.  

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