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Question
How do we distinguish pure fuel (alkanes) from fuel having impurities?
How do we distinguish pure fuel (alkanes) from fuel having impurities?
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Solution
The correct option is D Blue flame without soot
Pure fuel usually burns with a blue flame whereas fuels having impurities could end up with a mix of blue or yellow flames or sometimes only yellow flame. The color of a flame depends on the material being burned. There are lots of fuels that will produce blue flames when burned; the most commonly available one in the household is natural gas. Some flames are yellow because of the presence of a small amount of sodium atoms in the fuel. Blue flame also signifies the complete combustion and that can happen only with pure form of fuel.
Blue flame without soot
Pure fuel usually burns with a blue flame whereas fuels having impurities could end up with a mix of blue or yellow flames or sometimes only yellow flame. The color of a flame depends on the material being burned. There are lots of fuels that will produce blue flames when burned; the most commonly available one in the household is natural gas. Some flames are yellow because of the presence of a small amount of sodium atoms in the fuel. Blue flame also signifies the complete combustion and that can happen only with pure form of fuel.
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