345268 Which of the following are true?
(i) \(\mathrm{CFC}\) is responsible for ozone level depletion
(ii) Sulphur dioxide causes brown air effect during traffic congestion in cities.
(iii) Anthropogenic pollutants are natural in origin.
(iv) Benzene hexachloride is a non biodegradable pollutant.

345269 Ozone gas is_a_formed by the action of _ b _ on molecular oxygen, and also degraded into molecular oxygen in the _ c _.

345271 In which year an international treaty signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances became effective?

345272 Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

345268 Which of the following are true?
(i) \(\mathrm{CFC}\) is responsible for ozone level depletion
(ii) Sulphur dioxide causes brown air effect during traffic congestion in cities.
(iii) Anthropogenic pollutants are natural in origin.
(iv) Benzene hexachloride is a non biodegradable pollutant.

345269 Ozone gas is_a_formed by the action of _ b _ on molecular oxygen, and also degraded into molecular oxygen in the _ c _.

345271 In which year an international treaty signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances became effective?

345272 Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

345268 Which of the following are true?
(i) \(\mathrm{CFC}\) is responsible for ozone level depletion
(ii) Sulphur dioxide causes brown air effect during traffic congestion in cities.
(iii) Anthropogenic pollutants are natural in origin.
(iv) Benzene hexachloride is a non biodegradable pollutant.

345269 Ozone gas is_a_formed by the action of _ b _ on molecular oxygen, and also degraded into molecular oxygen in the _ c _.

345271 In which year an international treaty signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances became effective?

345272 Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

345268 Which of the following are true?
(i) \(\mathrm{CFC}\) is responsible for ozone level depletion
(ii) Sulphur dioxide causes brown air effect during traffic congestion in cities.
(iii) Anthropogenic pollutants are natural in origin.
(iv) Benzene hexachloride is a non biodegradable pollutant.

345269 Ozone gas is_a_formed by the action of _ b _ on molecular oxygen, and also degraded into molecular oxygen in the _ c _.

345271 In which year an international treaty signed at Montreal (Canada) in 1987 to control the emission of ozone depleting substances became effective?

345272 Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?