Previous Year Question
Which of the following metals is present as vapour in fluorescent tubes and CFLs and is toxic in nature?
A.
Tungsten
B.
Mercury
C.
Aluminium
D.
Titanium
Correct Answer: B
Detailed Solution
Fluorescent tubes and CFLs (Compact Fluorescent Lamps) contain a small amount of mercury. During operation, an electric discharge through mercury vapour produces ultraviolet radiation, which is converted into visible light by the phosphor coating on the inner surface of the tube. The EPA also confirms that CFLs contain mercury sealed inside their glass tubing.
Mercury is toxic, so broken CFLs and fluorescent lamps should be handled carefully and disposed of properly.