While cooking, if the bottom of the vessel is getting blackened on the outside, it means that (1) The food is not cooked completely (2) The fuel is not burning completely (3) The fuel is wet (4) The fuel is burning completely

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that (1) The food is not cooked completely (2) The fuel is not burning completely (3) The fuel is wet (4) The fuel is burning completely
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(2) The fuel is not burning completely Explanation: If we observe the bottoms of cooking vessels getting blackened, it means that the air holes are blocked and fuel is getting wasted.
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