question_answer

Chlorofluorocarbons, known as ozone-depleting substances, are used:

I. In the production of plastic foams

II. In the production of tubeless tyres

III. In cleaning certain electronic components

IV. As pressurizing agents in aerosol cans

A)  Only I             

B)  I, III & IV

C)  II & III             

D)  All the above