A powerful eye irritant present in smog is - (a) ozone (b) nitric oxide (c) peroxyacetyl nitrate (d) sulphur dioxide

A powerful eye irritant present in smog is - (a) ozone (b) nitric oxide (c) peroxyacetyl nitrate (d) sulphur dioxide
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A powerful eye irritant present in smog is – (1) nitric oxide (2) sulphur dioxide (3) peroxyacetyl nitrate (4) carbon dioxide

Description : A powerful eye irritant present in smog is – (1) nitric oxide (2) sulphur dioxide (3) peroxyacetyl nitrate (4) carbon dioxide

Last Answer : (3) peroxyacetyl nitrate Explanation: Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.

A powerful eye irritant present in smog is (1) nitric oxide (2) sulphur dioxide (3) peroxyacetyl nitrate (4) carbon dioxide

Description : A powerful eye irritant present in smog is (1) nitric oxide (2) sulphur dioxide (3) peroxyacetyl nitrate (4) carbon dioxide 

Last Answer : peroxyacetyl nitrate

What is a powerful eye irritant present in smog?

Description : What is a powerful eye irritant present in smog?

Last Answer : Sulphur dioxide

What is a powerful eye irritant present in smog?

Description : What is a powerful eye irritant present in smog?

Last Answer : Sulphur dioxide

1. Which is the oldest Development Financial Institution of India? 2. What is a powerful eye irritant present in smog? 3. Where is respiratory centre situated? 4. Which part of the Earth’s surface receives the highest amount of insolation? 5. Which are manuals of instruction in the form of brief rules?

Description : 1. Which is the oldest Development Financial Institution of India? 2. What is a powerful eye irritant present in smog? 3. Where is respiratory centre situated? 4. Which part of the Earth's ... famous for its deposits of nitrates? 20. Which queen enjoyed political power along with her husband?

Last Answer : Answer : 1. IFCI 2. Sulphur dioxide 3. Medulla oblongata 4. Tropical deserts 5. Sutras 6. Home Minister 7. Srinivas Ramanujan 8. Economics 9. Condensation 10. Tanjore 11. Less than unity 12. ... Cholas and Rashtrakutas 16. Export-Import Banks 17. Jimmy Carter 18. Acetylene 19. Atacama 20. Nur Jahan

Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as (A) Photochemical smog (B) Peroxyacetyl nitrate (PAN) or methyl nitrite (C) Benzopyrene (D) Polyacrylonitrile

Description : Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as (A) Photochemical smog (B) Peroxyacetyl nitrate (PAN) or methyl nitrite (C) Benzopyrene (D) Polyacrylonitrile

Last Answer : (B) Peroxyacetyl nitrate (PAN) or methyl nitrite

Which of the following causes death by asphyxiation, if its presence inatmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?(A) Benzopyrene(B) Peroxyacetyl nitrate(C) Carbon monoxide(D) Sulphur dioxide

Description : Which of the following causes death by asphyxiation, if its presence inatmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)? (A) Benzopyrene (B) Peroxyacetyl nitrate (C) Carbon monoxide (D) Sulphur dioxide

Last Answer : (C) Carbon monoxide

Peroxyacetyl nitrate (PAN), a pollutant is found in the (A) Automobile exhaust (B) Flue gas of coal based power plant (C) Exhaust of nitric acid plant (D) Exhaust of sulphuric acid plant

Description : Peroxyacetyl nitrate (PAN), a pollutant is found in the (A) Automobile exhaust (B) Flue gas of coal based power plant (C) Exhaust of nitric acid plant (D) Exhaust of sulphuric acid plant

Last Answer : (A) Automobile exhaust

Photochemical smog is formed from automobile exhaust (A) By reaction of hydrocarbon & nitric oxide in presence of sunlight (B) Appears only on sunny days (C) Is harmful for crops and trees also besides causing eye irritation & asthma (D) All (A), (B) & (C)

Description : Photochemical smog is formed from automobile exhaust (A) By reaction of hydrocarbon & nitric oxide in presence of sunlight (B) Appears only on sunny days (C) Is harmful for crops and trees also besides causing eye irritation & asthma (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Photochemical smog pollution does not contain (a) PAN (peroxyacyl nitrate) (b) ozone (c) nitrogen dioxide (d) carbon dioxide.

Description : Photochemical smog pollution does not contain (a) PAN (peroxyacyl nitrate) (b) ozone (c) nitrogen dioxide (d) carbon dioxide.

Last Answer : (d) carbon dioxide.

Which of the following is not a secondary air pollutant? (A) Ozone (B) Photochemical smog (C) Sulphur dioxide (D) All (A), (B) & (C)

Description : Which of the following is not a secondary air pollutant? (A) Ozone (B) Photochemical smog (C) Sulphur dioxide (D) All (A), (B) & (C)

Last Answer : (C) Sulphur dioxide

Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage? (A) Smog & ozone (B) Hydrogen fluoride & nitrogen oxides (C) Sulphur dioxide & spray of weed killers (D) Carbon monoxide

Description : Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage? (A) Smog & ozone (B) Hydrogen fluoride & nitrogen oxides (C) Sulphur dioxide & spray of weed killers (D) Carbon monoxide

Last Answer : (D) Carbon monoxide

Urea (a nitrogenous fertiliser) is produced from carbon dioxide and (A) Nitric acid (B) Ammonia (C) Ammonium nitrate (D) Nitric oxide

Description : Urea (a nitrogenous fertiliser) is produced from carbon dioxide and (A) Nitric acid (B) Ammonia (C) Ammonium nitrate (D) Nitric oxide

Last Answer : (B) Ammonia

Burning pyrites ore gives out – (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Description : Burning pyrites ore gives out – (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Last Answer : (2) Sulphur dioxide gas Explanation: The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS9. Pyrite remains in commercial use for the production of sulfur dioxide, for use in such applications as the paper industry, and in the manufacture of sulfuric acid.

Burning pyrites ore gives out (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Description : Burning pyrites ore gives out (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Last Answer : Sulphur dioxide gas 

Oxide of sulphur present in the atmosphere are washed down by rains to cause – (1) Depletion of fossil fuel reserves (2) Eutrophication in lakes (3) Lowering of pH of soil (4) Industrial smog formation

Description : Oxide of sulphur present in the atmosphere are washed down by rains to cause – (1) Depletion of fossil fuel reserves (2) Eutrophication in lakes (3) Lowering of pH of soil (4) Industrial smog formation

Last Answer : (1) Depletion of fossil fuel reserves Explanation: The oxide of Sulphur (Sulphur Dioxide) is washed down on earth as acid rain.

Oxide of sulphur present in the atmosphere are washed down by rains to cause : (1) Depletion of fossil fuel reserves (2) Eutrophication in lakes (3) Lowering of pH of soil (4) Industrial smog formation

Description : Oxide of sulphur present in the atmosphere are washed down by rains to cause : (1) Depletion of fossil fuel reserves (2) Eutrophication in lakes (3) Lowering of pH of soil (4) Industrial smog formation

Last Answer : Depletion of fossil fuel reserves

Which of the following are responsible for the formation of photochemical smog ? 1. Light intensity 2. Ratio of hydrocarbons to nitric oxide 3. CO2 4. Hydrocarbon reactivity 5. SO2 (a) 1, 2, 3, 4 and 5 (b) 1, 2 and 4 only (c) 2, 3 and 4 only (d) 2, 3 and 5 only

Description : Which of the following are responsible for the formation of photochemical smog ? 1. Light intensity 2. Ratio of hydrocarbons to nitric oxide 3. CO2 4. Hydrocarbon reactivity 5. SO2 (a) 1, 2, 3, 4 and 5 (b) 1, 2 and 4 only (c) 2, 3 and 4 only (d) 2, 3 and 5 only

Last Answer : (b) 1, 2 and 4 only

The most serious air pollutant causing health hazard is – (1) Sulphur dioxide (2) Carbon monoxide (3) Ozone (4) Nitrogen oxide

Description : The most serious air pollutant causing health hazard is – (1) Sulphur dioxide (2) Carbon monoxide (3) Ozone (4) Nitrogen oxide

Last Answer : (1) Sulphur dioxide Explanation: Sulphur dioxide (SO2) is considered as the most serious single air pollutant causing health hazard, obstructing breathing. It always leads to airways inflammation, ... , pulmonary oedema, heart failure and circulatory collapse. It is also responsible for acid rain.

Acid rain is caused by, the pollution of environment by - (1) carbon dioxide and nitrogen (2) carbon monoxide and carbon dioxide (3) ozone and carbon dioxide (4) nitrous oxide and sulphur dioxide

Description : Acid rain is caused by, the pollution of environment by - (1) carbon dioxide and nitrogen (2) carbon monoxide and carbon dioxide (3) ozone and carbon dioxide (4) nitrous oxide and sulphur dioxide

Last Answer : (1) carbon dioxide and nitrogen

Acid rain is caused by the pollution of environment by - (1) carbon dioxide and nitrogen (2) carbón monoxide and carbon dioxide (3) ozone and carbon dioxide (4) nitrous oxide and sulphur dioxide

Description : Acid rain is caused by the pollution of environment by - (1) carbon dioxide and nitrogen (2) carbón monoxide and carbon dioxide (3) ozone and carbon dioxide (4) nitrous oxide and sulphur dioxide

Last Answer : (4) nitrous oxide and sulphur dioxide

Acid rain is caused by the pollution of environment by – (1) Carbon monoxide and Carbon dioxide (2) Ozone and Carbon dioxide (3) Nitrous oxide and Sulphur dioxide (4) Carbon dioxide and Nitrogen

Description : Acid rain is caused by the pollution of environment by – (1) Carbon monoxide and Carbon dioxide (2) Ozone and Carbon dioxide (3) Nitrous oxide and Sulphur dioxide (4) Carbon dioxide and Nitrogen

Last Answer : (3) Nitrous oxide and Sulphur dioxide Explanation: Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances ... acidic pollutants, known as acid rain. Human activities are the main cause of acid rain.

Which one of the following group of gases contribute to the "Green House Effect"? (1) Carbon dioxide and Methane (2) Ammonia and Ozone (3) Carbon monoxide and Sulphur dioxide (4) Carbon tetrailouride and Nitrous oxide

Description : Which one of the following group of gases contribute to the "Green House Effect"? (1) Carbon dioxide and Methane (2) Ammonia and Ozone (3) Carbon monoxide and Sulphur dioxide (4) Carbon tetrailouride and Nitrous oxide

Last Answer : (1) Carbon dioxide and Methane Explanation: The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. When ranked by their direct contribution to the greenhouse ... 72 %, Carbon Dioxide: 9- 26 %, Methane: 4-9 % and Ozone: 3-7 %.

Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere? (1) Chlorofluorocarbons (2) Nitrous oxide (3) Sulphur dioxide (4) Carbon dioxide

Description : Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere? (1) Chlorofluorocarbons (2) Nitrous oxide (3) Sulphur dioxide (4) Carbon dioxide

Last Answer : (1) Chlorofluorocarbons Explanation: Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a ... methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol.

The most serious air pollutant causing health hazard is (1) Sulphur dioxide (2) Carbon monoxide (3) Ozone (4) Nitrogen oxide

Description : The most serious air pollutant causing health hazard is (1) Sulphur dioxide (2) Carbon monoxide (3) Ozone (4) Nitrogen oxide

Last Answer : Sulphur dioxide

Acid rain is caused by the pollution of environment by (1) Carbon monoxide and Carbon dioxide (2) Ozone and Carbon dioxide (3) Nitrous oxide and Sulphur dioxide (4) Carbon dioxide and Nitrogen

Description : Acid rain is caused by the pollution of environment by (1) Carbon monoxide and Carbon dioxide (2) Ozone and Carbon dioxide (3) Nitrous oxide and Sulphur dioxide (4) Carbon dioxide and Nitrogen

Last Answer : Actually Yes it is  The place with low humidity with the salt mixture in the air   Like places which have coal Brun, High urban population with modern gas transportaion and near to the beach where ... Salt helps these gases to mix well and give acid rain Places like Vizag in Andhra Pradesh 

Which one of the following group of gases contribute to the “Green House Effect”? (1) Carbon dioxide and Methane (2) Ammonia and Ozone (3) Carbon monoxide and Sulphur dioxide (4) Carbon tetraflouride and Nitrous oxide

Description : Which one of the following group of gases contribute to the “Green House Effect”? (1) Carbon dioxide and Methane (2) Ammonia and Ozone (3) Carbon monoxide and Sulphur dioxide (4) Carbon tetraflouride and Nitrous oxide

Last Answer : Carbon dioxide and Methane

Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ? (1) Nitrous oxide (2) Carbon dioxide (3) Chlorofluorocarbon (4) Sulphur dioxide

Description : Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ? (1) Nitrous oxide (2) Carbon dioxide (3) Chlorofluorocarbon (4) Sulphur dioxide

Last Answer : Chlorofluorocarbon

Peroxyacetyl nitrate is a – (1) Acidic dye (2) Plant hormone (3) Vitamin (4) Secondary pollutant

Description : Peroxyacetyl nitrate is a – (1) Acidic dye (2) Plant hormone (3) Vitamin (4) Secondary pollutant

Last Answer : (4) Secondary pollutant Explanation: Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog (a mixture of air pollutants) that includes both gases and particulates. It is ... decomposes into peroxy-ethanoyi radicals and nitrogen dioxide gas. It is a lathIymatory substance.

Peroxyacetyl nitrate is a (1) Acidic dye (2) Plant hormone (3) Vitamin (4) Secondary pollutant

Description : Peroxyacetyl nitrate is a (1) Acidic dye (2) Plant hormone (3) Vitamin (4) Secondary pollutant

Last Answer : Secondary pollutant

The smog in cities in India mainly consists of (A) Oxides Of sulphur (B) Oxides of nitrogen and unburnt hydrocarbons (C) Carbon monoxide and SPM (D) Oxides of sulphur and ozone

Description : The smog in cities in India mainly consists of (A) Oxides Of sulphur (B) Oxides of nitrogen and unburnt hydrocarbons (C) Carbon monoxide and SPM (D) Oxides of sulphur and ozone

Last Answer : (B) Oxides of nitrogen and unburnt hydrocarbons

Nitrogen in water is commonly found in the form of - (1) Nitrous oxide (2) Nitrate (3) Nitric oxide (4) Nitrite

Description : Nitrogen in water is commonly found in the form of - (1) Nitrous oxide (2) Nitrate (3) Nitric oxide (4) Nitrite

Last Answer : (2) Nitrate Explanation: Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than in surface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2).

Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric acid) 7. Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3

Nitrogen in water is commonly found in the form of (1) Nitrous oxide (2) Nitrate (3) Nitric oxide (4) Nitrite

Description : Nitrogen in water is commonly found in the form of (1) Nitrous oxide (2) Nitrate (3) Nitric oxide (4) Nitrite

Last Answer : Nitrate

The yellow colour in photochemical smog is due to the presence of------? A. Sulphur dioxide B. Carbon dioxide C. Nitrogen dioxide (Answer) D. CFC’s

Description : The yellow colour in photochemical smog is due to the presence of------? A. Sulphur dioxide B. Carbon dioxide C. Nitrogen dioxide (Answer) D. CFC’s

Last Answer : C. Nitrogen dioxide (Answer)

Which is a secondary air pollutant? (A) Photochemical smog (B) Sulphur dioxide (C) Nitrogen dioxide (D) Dust particles

Description : Which is a secondary air pollutant? (A) Photochemical smog (B) Sulphur dioxide (C) Nitrogen dioxide (D) Dust particles

Last Answer : (A) Photochemical smog

Which of the following is a secondary air pollutant? (A) Photochemical smog (B) Sulphur dioxide (C) Nitrogen dioxide (D) Dust particles

Description : Which of the following is a secondary air pollutant? (A) Photochemical smog (B) Sulphur dioxide (C) Nitrogen dioxide (D) Dust particles

Last Answer : (A) Photochemical smog

Which of the following pollutants affects the respiratory tract in humans? (A) Carbon monoxide (B) Nitric oxide (C) Sulphur di-oxide (D) Aerosols

Description : Which of the following pollutants affects the respiratory tract in humans? (A) Carbon monoxide (B) Nitric oxide (C) Sulphur di-oxide (D) Aerosols

Last Answer : (C) Sulphur di-oxide

The chemical name of Laughing gas is------? A. Nitric oxide B. Nitrogen dioxide C. Nitrogen pentoxide D. Nitrous oxide (Answer)

Description : The chemical name of Laughing gas is------? A. Nitric oxide B. Nitrogen dioxide C. Nitrogen pentoxide D. Nitrous oxide (Answer)

Last Answer : D. Nitrous oxide (Answer)

The chemical name of “laughing gas” is - (1) Nitric oxide (2) Nitrogen dioxide (3) Nitrogen pentoxide (4) Nitrous oxide

Description : The chemical name of “laughing gas” is - (1) Nitric oxide (2) Nitrogen dioxide (3) Nitrogen pentoxide (4) Nitrous oxide

Last Answer : (4) Nitrous oxide Explanation: Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is used in surgery and dentistry for its anesthetic and analgesic effects ... of inhaling it, a property that has led to its recreational use as a dissociative anesthetic.

Commercial nitric acid is coloured because it contains dissolved – (1) Oxygen (2) Nitrous oxide (3) Nitrogen dioxide (4) Coloured impurities

Description : Commercial nitric acid is coloured because it contains dissolved – (1) Oxygen (2) Nitrous oxide (3) Nitrogen dioxide (4) Coloured impurities

Last Answer : (3) Nitrogen dioxide Explanation: Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.

Which of the following is not a greenhouse gas? (1) Hydrogen (2) Carbon dioxide (3) Nitric oxide (4) Chlorofluorocarbon

Description : Which of the following is not a greenhouse gas? (1) Hydrogen (2) Carbon dioxide (3) Nitric oxide (4) Chlorofluorocarbon

Last Answer : (1) Hydrogen Explanation: A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere. that absorbs and emits radiation within the thermal infrared range. This process is the ... System, the atmospheres of Venus, Mars, and Titan also contain gases that cause greenhouse effects.

Which of the process is known as nitrification? (1) Reaction of Nitrogen Monoxide with oxygen to form nitric acid (2) Reaction of nitrogen dioxide with water to form nitric acid (3) Conversion of ammonia to nitrites (4) Conversion of nitrite to nitric oxide

Description : Which of the process is known as nitrification? (1) Reaction of Nitrogen Monoxide with oxygen to form nitric acid (2) Reaction of nitrogen dioxide with water to form nitric acid (3) Conversion of ammonia to nitrites (4) Conversion of nitrite to nitric oxide

Last Answer : Conversion of ammonia to nitrites

The chemical name of “laughing gas’ is (1) Nitric oxide (2) Nitrogen dioxide (3) Nitrogen pentoxide (4) Nitrous oxide

Description : The chemical name of “laughing gas’ is (1) Nitric oxide (2) Nitrogen dioxide (3) Nitrogen pentoxide (4) Nitrous oxide

Last Answer :  Nitrous oxide

Which of the following is not a greenhouse gas ? (1) Hydrogen (2) Carbon dioxide (3) Nitric oxide (4) Chlorofluorocarbon

Description : Which of the following is not a greenhouse gas ? (1) Hydrogen (2) Carbon dioxide (3) Nitric oxide (4) Chlorofluorocarbon

Last Answer : Hydrogen

Commercial nitric acid is coloured because it contains dissolved : (1) Oxygen (2) Nitrous oxide (3) Nitrogen dioxide (4) Coloured impurities

Description : Commercial nitric acid is coloured because it contains dissolved : (1) Oxygen (2) Nitrous oxide (3) Nitrogen dioxide (4) Coloured impurities

Last Answer : Nitrogen dioxide

Which of the following nitrogen-containing compounds is most readily used by plants? w) nitrogen dioxide x) ammonia y) nitrous oxide z) nitrate

Description : Which of the following nitrogen-containing compounds is most readily used by plants? w) nitrogen dioxide x) ammonia y) nitrous oxide z) nitrate

Last Answer : ANSWER: Z -- NITRATE

Which of the following is not a covalent network solid? w) silicon dioxide x) silicon oxide y) boron nitrate z) sodium oxide

Description : Which of the following is not a covalent network solid? w) silicon dioxide x) silicon oxide y) boron nitrate z) sodium oxide

Last Answer : ANSWER: D -- SODIUM OXIDE

Irritation in eyes is caused by the pollutant (A) Sulphur di-oxide (B) Ozone (C) PAN (D) Nitrous oxide

Description : Irritation in eyes is caused by the pollutant (A) Sulphur di-oxide (B) Ozone (C) PAN (D) Nitrous oxide

Last Answer : Answer: C

The depletion in Ozone layer is caused by - (1) Nitrous oxide (2) Carbon dioxide (3) Chlorofluorocarbons (4) Methane

Description : The depletion in Ozone layer is caused by - (1) Nitrous oxide (2) Carbon dioxide (3) Chlorofluorocarbons (4) Methane

Last Answer : (3) Chlorofluorocarbons Explanation: Chlorofluorocarbons (CFCs), also known as Freon, cause the breakdown of the ozone layer that protects the earth from the sun's ultraviolet (UV) radiation. In the ... depletion in the upper atmosphere, CFCs have been phased out under the Montreal Protocol of 1987.