Question

While cooking, if the bottom of the utensil 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

Mark it as branliest ✌️

in my opinion option 'b' is the answer

because vessels aquire black colour due to unburnt fuel particles

Answer 2

While cooking, if the bottom of the utensil is getting blackened on the outside, it means that the fuel is not burning completely.

Explanation:

• When a fuel burns for a long time under burning or at a low temperature, residue begins to precipitate on the vessel surface due to incomplete combustion of hydrocarbons at the heating section.
• When the fuel is not burned properly, it begins to produce incomplete burning vapours or black vapours falling to the bottom of the container.
• To avoid the emission of black combustion gases, we need to burn the fuel to the average burning temperature or flame.

Therefore the correct answer is Option (b) the fuel is not burning completely.