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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.

Science - Science

Chapter_Carbon and its Compounds


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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