Question

Why does kerosene burn with a blue flame in wick stove but produces a yellow flame when burnt in a lamp?​

Answer 1

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In a stove, the kerosene undergoes complete combustion due to sufficient supply of oxygen which is provided through the holes in the jacket around the wick.

In a lamp, due to the presence of chimney around the flame, the supply of oxygen is limited resulting in incomplete combustion giving a yellow flame.

Answer 2

Kerosene is going under complete combustion but wick stove is going under incomplete combustion . In complete combustion blue flame is produced and in incomplete combustion yellow flame with sooth is produced.