If you use a orange colored flame for heating a flask and it blackens the bottom of the flask, what should be corrected to solve this problem?

Move the flask farther from the flame.

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Allow more air into the collar of the burner.

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Allow less air into the collar of the burner.

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Move the flask closer to the flame

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The problem is in the supply of the gas, and you cannot fix it.

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Solution

The correct option is B Allow more air into the collar of the burner.
If you use a orange colored flame for heating a flask and it blackens the bottom of the flask, to solve this problem, you should allow more air into the collar of the burner. The balckening of flame is due to incomplete combustion due to lack of oxygen, when air is passed, complete combustion occurs and prevents the blackening of flame.

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Similar questions

Q. Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.

Give reason for the following:
(a) Air holes of the gas burners have to be adjusted when heated vessels get blackened by the flame.
(b) Use of synthetic detergents causes pollution problems.

Q. A flask has a volume of

0.25 d m^{3}

. What volume of air will be displaced from the flask if it is heated from

300 K

360 K

250 m l

round bottom flask containing air was heated from

27^{o} C

477^{o} C

. Calculate what fraction of the air is left behind in the flask.

Q. Give reasons for the following observations:
(a) Air holes of a gas burner have to be adjusted when the vessels being heated get blackened by the flame.
(b) Use of synthetic detergents causes pollution of water.

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