NEET Chemistry Environmental Chemistry MCQs Set A

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 one of the following pollutants causes irritation in eye?

• a) CO₂ 
• b) SO₂
• c) NO₂ 
• d) All of these

Answer:  SO₂

Question: A primary pollutant is

• a) CO
• b) DDT
• c)  CO₂
• d) All of these

Answer: All of these

Question: Which one of the following is colourless and highly toxic gas which reduces oxygen carrying capacity of blood?

• a) SO₂  
• b) CO
• c) NO
• d) SO₃

Answer: CO

Question: Which one of the following affects chlorophyll?

• a) Sulphur dioxide
• b) Nitrogen oxides
• c) Carbon monoxide
• d) Both (1) & (2)

Answer: Sulphur dioxide

Question: Which one of the following oxides produces brown air or reddish brown haze?

• a) Oxides of sulphur
• b) Oxides of nitrogen
• c) Oxides of carbon
• d) All of these

Answer: Oxides of nitrogen

Question: Which one of the following gaseous pollutants is carcinogenic?

• a) Oxides of sulphur
• b) Oxides of nitrogen
• c) Arsenic
• d) Oxides of carbon

Answer: Arsenic

Question: Greenhouse gases cause

• a) Trap UV rays
• b) Increase in temperature of atmosphere
• c) Prevents global warming
• d) All of these

Answer: Increase in temperature of atmosphere

Question:  Greenhouse gas other than CO₂ is

• a) H₂ 
• b) N₂O
• c) O₂
• d) SO₂

Answer: N₂O

Question: Photochemical smog involves

• a) O₃ 
• b) NO
• c) NO₂
• d) All of these

Answer: All of these

Question: pH of acid rain is approximately

• a) 5.6
• b) 6.2
• c) 6.7
• d) 7

Answer: 5.6

Question: One of the greenhouse gas is

• a) CO
• b) O₂
• c) H₂  
• d) CFC’s

Answer: CFC’s

Question: Acid rain causes

• a) Chlorosis
• b) Increasing acidity of soil
• c) Corroding bridges
• d) All of these

Answer: All of these

Question: Interference in development and maturation of RBC is caused by

• a) Hg pollution
• b) Pb pollution
• c) S pollution
• d) All of these

Answer: Pb pollution

Question: Select viable pollutant.

• a) Smoke
• b) Moulds
• c) Mist
• d) Fumes

Answer: Moulds

Question: Which one of the following is not a property of classical smog?

• a) Occurs at low temperature
• b) Secondary pollutant play significant role
• c) Contains SO₂
• d) Dark brown coloured

Answer: Secondary pollutant play significant role

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

Question: Which is not a cause of acid rain?

• a) NO₂ 
• b) CH₄
• c) SO₂   
• d) CO₂

Answer:  CH₄

Question: Photochemical smog is actually a cause of pollution of

• a) Soil
• b) Air
• c) Noise
• d) Water

Answer: Air

Question: Photochemical smog always contains

• a) SO₂ 
• b) O₃
• c) HNO₃
• d) All of these

Answer:  O₃

Question: Photochemical smog includes the reduction of

• a) SO₂ 
• b) NO
• c) Cl₂
• d) NO₂

Answer:  NO₂

Question: Earth is protected from UV rays by

• a)  N₂
• b) O₂
• c) O₃ 
• d) SO₃

Answer:  O₃ 

Question: Months in which ozone hole appears over poles is

• a) June-July
• b) August-September
• c) October-November
• d) December-January

Answer: August-September

Question: Depletion of ozone layer can not cause

• a) Damage of DNA
• b) Skin cancer
• c) Cataract
• d) Rickets

Answer: Rickets

Question: Depletion of ozone layer causes

• a) Increased transpiration
• b) Damages paints and fibres
• c) Causes aging of skin
• d) All of these

Answer: All of these

Question: Which one of the following gases is known as chemical weed in troposphere?

• a) C₂H₆
• b) SO₂ 
• c) O₃
• d) NO₂

Answer:  O₃

Question: Which causes water pollution?

• a) Jet planes
• b) Herbicides
• c) Smoke
• d) Combustion of fossils

Answer: Herbicides

Question: Most common and commercial water pollutant is

• a) Industrial waste
• b) Fertilizers
• c) Detergents
• d) PCB’s

Answer: Industrial waste

Question: For clean water BOD is less then

• a) 17 ppm
• b) 12.2 ppm
• c) 7 ppm
• d) 5 ppm

Answer: 5 ppm

Question: Cause of eutrophication is

• a) Nutrient enrichment of water bodies
• b) Increase of oxygen in water bodies
• c) Increase in number of aquatic organisms
• d) All of these

Answer: Nutrient enrichment of water bodies

Question: Inorganic pollutant can damage

• a) Central nervous system
• b) Liver
• c) Kidneys
• d) All of these

Answer: All of these

Question: Decomposition of organic matter through microbial activity is known as

• a) Eutrophication
• b) Stratification
• c) Putrescibility
• d) BOD

Answer: Putrescibility

Question: Permissible level of nitrate ions in the drinking water is

• a) 40 ppm
• b) 50 ppm
• c) 60 ppm
• d) 70 ppm

Answer: 50 ppm

Question: Tooth decay is caused by deficiency of

• a) Fluorides
• b) Lead
• c) Sulphates
• d) Nitrates

Answer: Fluorides

Question: Laxative effect is caused by

• a) Nitrates
• b) Sulphates
• c) Lead
• d) Fluoride

Answer: Sulphates

Question: Soil pollution can result in decreased

• a) Soil productivity
• b) Quality of plants
• c) Purity of ground water
• d) All of these

Answer: All of these

Question: Which one of the following is not an organochlorine?

• a) Parathion
• b) DDT
• c) BHC
• d) Aldrin

Answer: Parathion

Question: Which one of the following is least persistent insecticide?

• a) Aldrin
• b) Dieldrin
• c) BHC
• d) Carbamates

Answer: Carbamates

Question: Which one of the following is a herbicide?

• a) Organochlorines
• b) Organophosphates
• c) Carbamates
• d) Sodium arsinite

Answer: Sodium arsinite

Question: Non-biodegradable industrial waste that can be utilized by cement industry is

• a) Fly ash
• b) Slag
• c) Gypsum
• d) Both (1) & (2)

Answer: Both (1) & (2)

Question: Small quantity of industrial toxic waste is removed by

• a) Burning in open bins
• b) Controlled incineration
• c) Burning in closed bins
• d) Both (1) & (2)

Answer: Burning in open bins

Question: Select non-biodegradable industrial waste

• a) Waste from cotton mills
• b) Waste from paper mills
• c) Fly ash from thermal power plants
• d) Waste from food processing units

Answer: Fly ash from thermal power plants

Question: Which one of the following is not a non-biodegradable industrial waste?

• a) Gypsum from fertilizer industries
• b) Mud and tailings from metal industries
• c) Slag from steel industries
• d) Waste from textile industries

Answer: Waste from textile industries

Question: Biodegradable wastes are mixed with water and cultured from bacterial species which produces a gas called

• a) Methane gas
• b) Ethane gas
• c) Propane gas
• d) Butane gas

Answer: Methane gas

Question: Sewage sludge does not contain

• a) Nitrogen
• b) Phosphorus
• c) Potassium
• d) All of these

Answer: Potassium

Question: Green chemistry emphasizes on

• a) Reaction that takes place in non-aqueous medium
• b) Utilization of sciences to reduce adverse impact on environment
• c) Use of condensation polymers
• d) Minimise the use of non-hazardous waste

Answer: Utilization of sciences to reduce adverse impact on environment

Question: In place of tetrachloroethene in dry-cleaning we use

• a) Sodium lauryl sulphate
• b) Sodium stearate
• c) Hydrogen peroxide
• d) Sodium bisulphite

Answer: Hydrogen peroxide

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: Chauvin, Grubbs and Schrock won 2005 Nobel prize for the development of

• a) Dumas method
• b) Kjeldahl’s method
• c) Metathesis method
• d) Carius method

Answer: Metathesis method

Question: About 20 km above the earth, there is an ozone layer. Which one of the following statement about ozone and ozone layer is true?

• a) It is beneficial to us as it stops U.V. radiation
• b) Conversion of O₃ to O₂ is an endothermic reaction
• c) Ozone has a triatomic linear molecule
• d) It is harmful as it stops useful radiation

Answer: It is beneficial to us as it stops U.V. radiation

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: Which one of the following statements 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:  Which of the following is not caused due to SO₂?

• a) Cough
• b) Shortness of breath
• c) Spasm of larynx
• d) Blindness

Answer: Blindness

Question: Which of the following is not a green house gas?

• a) CO₂ 
• b) CH₄
• c) CCl₂F₂ 
• d) O₂

Answer:  O₂

Question: At which of the following concentration of sulphate it will have a laxative effect?

• a) Above 300 ppm
• b) Above 500 ppm
• c) Above 400 ppm
• d) Above 600 ppm

Answer: Above 500 ppm

Question: At which of the following pH, rain is called acid rain?

• a) 4
• b) 6
• c) 6.8
• d) All of these

Answer: 4

Question: Which of the following has not adverse effect on human health?

• a) CO₂ 
• b) NO₂
• c) SO₂ 
• d) CO

Answer:  CO₂ 

Question: Which of the following is Freon-11?

• a) CCl₃F
• b) CCl₂F₂
• c) CClF₃ 
• d) CF₄

Answer: CCl₃F