Question

A lilac-colored flame is produced on heating
A. Potassium in a flame
B. Cobalt in a flame
C. Sodium in a flame
D. Methane in oxygen

Answer 1

Hint: Combustion is a compound cycle or a response between Fuel (Hydrocarbon) and Oxygen. At the point when fuel and oxygen respond it delivers the warmth and light energy. Warmth and light energy at that point bring about the fire. In this way, the equation for Combustion response is Hydrocarbon + Oxygen = Heat energy.

Complete step-by-step answer: Potassium on heating delivered lilac-colored fire in light of the fact that on warming, a particle elements its electrons and they leap to higher energy levels. At the point when the electron re-visitation of lower energy levels, they produce energy as light. The shading delivered on warming relies on the frequency of discharged light.

Additional Information:
What are the parts of the flame?
Internal Part: This is the deepest part of the fire. It is the part nearest to the wick. You may accept that this is the most sizzling piece of the fire. Be that as it may, it is the most un-hot. This is the dark piece of the flares that contains unburnt particles of the carbon from the wick for example unburnt fuel.
Center Part: This is the biggest part of the fire. The shadings in this are shifting shades of yellow and orange. This is the brilliant fire since it emanates light. This part is likewise not very hot. This is on the grounds that this part gets restricted gracefully of oxygen. So inadequate burning happens here. Which is the reason it consumes orange and is glowing.
External Part: Now this is the hottest part of the fire. This part has a limitless flexibility of oxygen. So complete burning happens here. Thus it is the most blazing piece of the fire. Likewise, this piece of the flares ignites with a blue tone. It is the non-brilliant, for example doesn't transmit light

Thus, the correct option is A.

Note: At the point when you light a flame a combustion response happens with the wax of the candle which is the fuel and the air which contains oxygen. The blazes are the are in which this ignition response is occurring. The arrival of warmth and light energy from this exothermic response occurs through the fire.