While cooking, if the bottom of the vessel is getting blackened on the outside, it means that
(a) the food is not cooked completely.
(b) the fuel is not burning completely.
(c) the fuel is wet.
(d) the fuel is burning completely.
NCERT Class X
Science - Science
Chapter_Carbon and its Compounds
Answers
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It means that the fuel is not burnt completely. The blackening on the outside happens due to deposit of un-burnt carbon.
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Answer: Option (b) is the correct answer.
Explanation:
When there is less supply of oxygen then upon burning of fuel like LPG there will be incomplete combustion of fuel that results into the formation of carbon monoxide and carbon instead of formation of carbon dioxide.
Hence, soot will be formed due to this incomplete combustion that shows emission of carbon.
Therefore, we can conclude that while cooking, if the bottom of the vessel is getting blackened on the outside, it means that the fuel is not burning completely.
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