Question

Give scientific reason 2) Naphthalene burns with a yellow flame.
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Answer 1

Answer:

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(1) Naphthalene is an unsaturated compound. In unsaturated hydrocarbon the proportion of carbon is larger than that of saturated hydrocarbon.

(2) In the flame, these unburnt hot carbon particles emit yellow light and therefore the flame appears yellow. Hence, naphthalene burns with a yellow flame.

Answer 2

The yellow flame produced when naphthalene burns is due to the presence of sulfur in the naphthalene molecule.

• When naphthalene is burned, the sulfur in the molecule reacts with oxygen in the air to form sulfur dioxide (SO2), which has a yellow color. The yellow flame is a result of this reaction and the emission of light by excited sulfur dioxide molecules.
• The high temperature of the flame excites other species in the flame, including carbon and hydrogen, which can also contribute to the yellow color. The exact color of the flame depends on the chemical composition of the substance being burned, as well as the temperature and conditions of the flame.

• Naphthalene is a white crystalline solid that is commonly used as a moth repellent and as a raw material in the manufacture of dyes, pigments, and other chemicals. It has a strong, musty odor and is found in many household products, including mothballs, toilet bowl deodorants, and some types of air fresheners.
• Naphthalene is also used as a fuel in some industrial applications and is known to be highly flammable. It is important to handle and use naphthalene with caution, as it can be toxic if ingested or inhaled in high quantities.

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