Chlorofluorocarbon releases a chemical harmful to ozone:

Options

A. Fluorine
B. Chlorine
C. Nitrogen peroxide
D. Sulphur dioxide

Answer

B

Explanation

CFCs is discharged in lowered part atmosphere moves upward and reach stratosphere.
CFCs or freon is released mainly from refrigerators. In stratosphere ultraviolet rays act on CFCs releasing Cl-atoms,
Cl degrades ozone releasing molecular oxygen.
Cl atoms are not consumed in the reaction, these atoms acting merely as catalyst, hence whatever CFCs are added to the stratosphere they have permanent and continuing effects on ozone levels.