NEET Chemistry Environmental Chemistry MCQs Set B

Question: Measurement of dissolved oxygen that would be needed by the microorganism to oxidise the compounds is known as

• a) Acid rain
• b) BOD
• c) COD
• d) Ozone layer depletion

Answer: BOD

Question: Green house gases

• a) Allow shorter wavelength to enter earth’s atmosphere while doesn’t allow longer wavelength to leave the earth’s atmosphere
• b) Allow longer wavelength to enter earth atmosphere while doesn’t allow shorter wavelength to leave the surface
• c) Don’t have wavelength specific character
• d) Near to earth show wavelength specific behaviour while far from earth have wavelength independent behaviour

Answer: Allow shorter wavelength to enter earth’s atmosphere while doesn’t allow longer wavelength to leave the earth’s atmosphere

Question: Which of the following is the correct match?

• a) Classical smog – NO₂
• b) Photochemical smog – SO₂
• c) Green house gas – CH₄
• d) Both (1) & (3)

Answer:  Green house gas – CH₄

Question: Which group correctly represent the photochemical smog produced during reaction of hydrocarbon in the combustion chamber of an engine?

• a) Formaldehyde and PAN
• b) Acrolein and PAN
• c) Formaldehyde and acrolein
• d) Formaldehyde, acrolein and PAN

Answer: Formaldehyde, acrolein and PAN

Question: Freons which cause damage to ozone layer are

• a) Chemically unreactive
• b) Non toxic
• c) Odourless
• d) All of these

Answer: All of these

Question: Which of the following is herbicide?

• a) DDT
• b) (CH₃)₂Hg
• c) NaClO₃ 
• d) C₂H₂

Answer:  NaClO₃ 

Question: Ozone depletion over Antarctica is maximum in the month of

• a) September and October
• b) March and April
• c) June and July
• d) December and January

Answer: September and October

Question: Heat pollution affects mainly

• a) Vegetation
• b) Aquatic creature
• c) Rocks
• d) Air

Answer: Aquatic creature

Question: Bhopal gas tragedy was caused by

• a) CH₃CN 
• b) CH₃NC
• c) CH₃N = C = O 
• d) CH₃—N = O

Answer:  CH₃N = C = O 

Question: What is the name of chlorine containing antibiotic?

• a) Chloretone
• b) Chloroform
• c) Chloromycetin
• d) Carbontetrachloride

Answer: Chloromycetin

Question: How much percentage of air by mass is present in troposphere?

• a) 40
• b) 60
• c) 80
• d) 100

Answer: 80

Question: Which one of the following is not a common component of Photochemical Smog?

• a) Ozone
• b) Acrolein
• c) Peroxyacetyl nitrate
• d) Chlorofluorocarbons

Answer: Chlorofluorocarbons

Question: Which one of the following statements regarding photochemical smog is not correct?

• a) Photochemical smog is formed through photochemical reaction involving solar energy
• b) Photochemical smog does not cause irritation in eyes and throat
• c) Carbon monoxide does not play any role in photochemical smog formation
• d) Photochemical smog is an oxidising agent in character

Answer: Photochemical smog does not cause irritation in eyes and throat

Question: Which one of the following statement is not true ?

• a) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant
• b) pH of drinking water should be between 5.5 – 9.5
• c) Concentration of DO below 6 ppm is good for the growth of fish
• d) Clean water would have a BOD value of less than 5 ppm

Answer: Concentration of DO below 6 ppm is good for the growth of fish

Question: Green chemistry means such reactions which

• a) Study the reactions in plants
• b) Produce colour during reactions
• c) Reduce the use and production of hazardous chemicals
• d) Are related to the depletion of ozone layer

Answer: Reduce the use and production of hazardous chemicals

Question: Which of the following is a secondary pollutant?

• a) CO₂
• b) N₂O
• c) SO₂  
• d) PAN

Answer: PAN

More Questions.................................

Question: ‘White lung cancer’ is caused by

• a) Asbestos
• b) Silica
• c) Textiles
• d) Paper

Answer: Textiles

Question:  BOD₅ is

• a) Waste decomposed in 5 days
• b) Oxygen used in 5 days
• c) Microorganisms killed in 5 days
• d) Dissolved oxygen left after 5 days

Answer: Oxygen used in 5 days

Question: Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?

• a) Polyhalogens
• b) Ferrocene
• c) Fullerenes
• d) Freons

Answer: Freons

Question: Ozone in the stratosphere is deleted by

• a) CF₂Cl₂
• b) C₇F₁₆
• c) C₆H₆Cl₆  
• d) C₆F₆

Answer:  CF₂Cl₂

Question: Pick up the correct statement :

• a) CO which is a major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog
• b) Classical smog has an oxidizing character while the photochemical smog is reducing in character
• c) Photochemical smog occurs in day time whereas the classical smog occurs in the morning hours
• d) During formation of smog the level of ozone in the atmosphere goes down

Answer: Photochemical smog occurs in day time whereas the classical smog occurs in the morning hours

Question: The smog is essentially caused by the presence of

• a) O₂ and O₃  
• b) O₂ and N₂
• c) Oxides of sulphur and nitrogen
• d) O₃ and N₂

Answer: Oxides of sulphur and nitrogen

Question: In Antartica, ozone depletion is due to the formation of the following compound

• a) Acrolein
• b) Peroxy acetyl nitrate
• c) SO₂ and SO₃  
• d) Chlorine nitrate

Answer: Chlorine nitrate

Question: High concentration of fluoride is poisonous and harmful to bones and teeth at levels over

• a) 1 ppm
• b) 3 ppm
• c) 5 ppm
• d) 10 ppm

Answer: 10 ppm

Question: Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?

• a) Is used as a food-preservative
• b) Forms 'acid-rain'
• c) Is a reducing agent
• d) Is soluble in water

Answer: Is used as a food-preservative

Question: The layer of atmosphere which extends upto 10 km from sea level is called

• a) Troposphere
• b) Stratosphere
• c) Ionosphere
• d) Mesosphere

Answer: Troposphere

Question: Those pollutants which are readily degradable by natural process are called

• a) Biodegradable pollutant
• b) Non-biodegradable pollutant
• c) Primary pollutant
• d) Secondary pollutant

Answer: Biodegradable pollutant

Question: Troposphere pollutant contains

• a) Dust
• b) Water vapours
• c) Mist
• d) All of these

Answer: All of these

Question: Which one of the following is a secondary pollutant?

• a) CO
• b) O₃
• c) Pb
• d) CH₄

Answer: O₃

Question: Which of the following is not a greenhouse gas?

• a) CO₂  
• b) CH₄
• c) O₃
• d) N₂

Answer:  N₂