Question

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.

Answer 1

Hint: Incomplete combustion: It is defined as a reaction that does not convert all the carbon and hydrogen into water or carbon dioxide. This kind of burning possibly happens when there is deficient oxygen to permit fuel different mixes separated from carbon monoxide.

Complete answer:

While cooking, if the base of the vessel is getting darkened outwardly, it implies that the fuel isn't consuming totally. At the point when the fuel consumes totally giving a blue flame, the base of the vessel stays clean. At the point when any fuel that consumes beneath its consuming or low temperature for quite a while it begins to store residue on the outside of the vessel, because of incomplete burning of hydrocarbons in the warming spot.
When the fuel doesn't consume totally then a dirty flame shows up which makes the base of the utensil dark. It is because of the air openings, which are getting blocked and the fuel doesn't consume totally.
At the point when fuel doesn't consume appropriately, it starts to form incomplete burning fumes or black fumes that store on the base surface of the pot, to prevent the arrival of black burning gas discharge we have to burn the fuel at its burning temperature or medium flame.

So, the correct answer is “Option B”.

Note: The possibility to make a mistake is that you may choose option C. Wet gas is defined as a gas when a small amount of liquid is present but incomplete combustion means when there is lack of oxygen, so the blackening of the vessel occurs due to incomplete combustion not because the fuel is wet. Don’t confuse between them.