Which gas color is Green?

Which gas color is Green?

• A. Fluorine gas
• B. Chlorine gas
• C. Bromine gas
• D. Iodine gas

Answer: (B)

Greenish-yellow is seen with chlorine gas. The color of a gas comes from which wavelengths of visible light it absorbs and transmits. Chlorine molecules absorb blue light more strongly, so the light that passes through or is reflected from the gas looks greenish-yellow. Other halogens have different colors in the gas phase: fluorine is a pale yellow gas, bromine is a reddish-brown liquid with a yellowish vapor, and iodine is a violet color when vaporized. So the gas that appears green is chlorine.

Greenish-yellow is seen with chlorine gas. The color of a gas comes from which wavelengths of visible light it absorbs and transmits. Chlorine molecules absorb blue light more strongly, so the light that passes through or is reflected from the gas looks greenish-yellow. Other halogens have different colors in the gas phase: fluorine is a pale yellow gas, bromine is a reddish-brown liquid with a yellowish vapor, and iodine is a violet color when vaporized. So the gas that appears green is chlorine.