due to the mass of oxygen which has combined with the candle
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B
due to the mass of nitrogen which has combined with the candle
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C
due to the mass of nitrogen and oxygen which has combined with the candle
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D
All of the above
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Solution
The correct option is A due to the mass of oxygen which has combined with the candle Candle gains weight on burning due to the oxygen present in air which is combined with the candle.