Burning of naphthalene on a spatula gives a __________.
sooty flame
The correct answer is option 2 i.e. sooty flame.
When naphthalene is burnt on a spatula, it produces a sooty flame. This happens because naphthalene is a hydrocarbon that contains a high percentage of carbon. During incomplete combustion, the carbon particles do not fully oxidize, resulting in the formation of soot. The presence of soot gives the flame a black, smoky appearance, which is identified as a sooty flame. This type of flame indicates that combustion is not complete, and it releases unburnt carbon into the air. Thus, the correct answer is sooty flame, which is a clear sign of incomplete combustion of naphthalene.
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