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प्रश्न
Why does a candle become smaller on burning with time?
थोडक्यात उत्तर
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उत्तर
On heating, candle wax melts, then turns into vapour which reacts with air to produce two new substances, carbondioxide and water. Therefore a candle on burning becomes smaller and smaller and the part of wax which has undergone chemical change cannot be recovered.
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