Which of the following are ozone depleting chemicals 1 Trichloroethane 2 Bromochloromethane 3 Methyl...........

Environment and Ecology Envirnment and Climate Change

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Which of the following are ozone depleting chemicals?

1.Trichloroethane

2.Bromochloromethane

3.Methyl chloroform

4.Carbon tetrachloride

Select the correct answer using the codes below.

1 and 2 only

2 , 3 and 4 only

1 , 3 and 4 only

1 , 2, 3 and 4

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Explanation:

They are widely used in refrigerators, airconditioners, fire extinguishers, in dry cleaning, as solvents for cleaning, electronic equipment and as agricultural fumigants.
Ozone depleting substances controlled by Montreal Protocol include: Chlorofluorocarbons (CFCs); Halon; Carbon tetrachloride (CCl4), Methyl chloroform (CH3CCl3); Hydrobromofluorocarbons (HBFCs); Hydrochlorofluorocarbons (HCFCs); Methyl bromide (CH3Br); and Bromochloromethane (CH2BrCl).
The UNEP has developed a useful database called the 'Inventory of Trade Names of Chemical Products Containing Ozone Depleting Substances and their Alternatives’.
The database lists all the trade names of ozone depleting substances, and also provides iformation on alternatives commercially available.