Which of the following substances does not give flames during burning?

Charcoal

The correct answer is option 3. Charcoal.

The ability of a substance to produce flames during burning is closely related to its combustion characteristics, and different substances exhibit varied behavior during the burning process:

1. Kerosene Oil:

Kerosene oil is a liquid hydrocarbon fuel commonly used in lamps, heaters, and stoves. When burned, kerosene oil produces flames. The flames result from the combustion of vaporized kerosene, which releases heat and light.

2. Molten Wax:

Molten wax, typically in the form of a candle, can produce flames during burning. In a candle, the wax melts and is drawn up through the wick by capillary action. The vaporized wax then combusts, producing a flame. The flame is sustained by the continuous supply of molten wax drawn up through the wick.

3. Charcoal:

Charcoal, on the other hand, is a form of carbon obtained by heating wood or other organic materials in the absence of air. It is a solid fuel that does not produce flames during burning. Instead of flames, charcoal undergoes a process called smoldering. This is a slow, low-temperature combustion that doesn't produce the visible, bright flames associated with some other fuels.

Conclusion:

While kerosene oil and molten wax are examples of substances that produce flames during burning, charcoal behaves differently. Charcoal combustion results in a steady release of heat and the production of ash, without the characteristic flames seen in some liquid or gaseous fuels.

Therefore, the correct statement is "Charcoal does not give flames during burning."