Question

Chlorine atoms in the upper atmosphere cause the breakdown of ozone.
$Cl+O_3\to O_2+ClO$
$ClO+O\to Cl+O_2$
Which statements are correct when referring to these chlorine atoms?
$1$. The chlorine atoms act as catalysts.
$2$. The chlorine atoms are free radicals.
$3$. The chlorine atoms are formed by heterolytic fission of a covalent bond in chlorofluorocarbons.

• A. $1,2$ and $3$ are correct
• B. $1$ and $2$ only are correct
• C. $2$ and $3$ only are correct
• D. $1$ only is correct

Answer 1

The correct option is B $1$ and $2$ only are correct

In the given reaction, i.e., decomposition of ozone, the chlorine atoms are free radicals and acts as catalysts.

Chlorine initiates the breakdown of ozone and combines with a freed oxygen to create two oxygen molecules.

Hence only $1$ and $2$ are correct.