Q. 'HCFCs' can be used in refrigerants instead of

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Q. Feron 'II' served as a

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Q. Molecules of 'CFCs' are dissociated by ultraviolet radiations in the

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Q. 'Bromine' free radical are more destructive than

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Q. In 1992, representatives from nearly 180 nations, met in

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Q. CFCs can form bubbles in foam, making it a good

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Q. How many treaties were signed to ban CFCs?

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Q. A single molecule of 'feron' gas can destroy a thousands of

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Q. When was 'Montreal protocol' signed by 24 nations?

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Q. Antarctic ozone layer is known as

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Q. Which chemical is used in air conditions and refrigerators ?

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Q. What does ultraviolet radiation cause ?

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Q. Over heavily polluted areas of America and Europe, ozone level has fallen about

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Q. What gases are involved in ozone depletion ?

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Q. Nonisothermal vortex shedding based on:

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Q. Nitric oxide gas reacts with ozone molecule to form

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Q. Earth is encircled in a layer of air, known as

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Q. Without ozone layer all terrestrial animals will be

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Q. Freon 12 belongs to group known as

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Q. Exposure to ultraviolet rays can cause:

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