AIR
1.What percentage of air is composed of nitrogen?
a) 20.95%
b) 78.09%
c) 0.93%
d) 0.04%
Answer: b) 78.09%
2.What is the approximate percentage of oxygen in the atmosphere?
a) 78.09%
b) 20.95%
c) 0.93%
d) 0.04%
Answer: b) 20.95%
3.What is the approximate percentage of carbon dioxide in the atmosphere?
a) 78.09%
b) 20.95%
c) 0.93%
d) 0.04%
Answer: d) 0.04%
4.What percentage of the Earth's atmosphere is composed of argon?
a) 78.09%
b) 20.95%
c) 0.93%
d) 0.04%
Answer: c) 0.93%
5.Which gas constitutes approximately 0.93% of the Earth's atmosphere?
a) Nitrogen
b) Oxygen
c) Argon
d) Carbon dioxide
Answer: c) Argon
6.Which gas is the most abundant in Earth's atmosphere?
a) Oxygen
b) Nitrogen
c) Argon
d) Carbon dioxide
Answer: b) Nitrogen
7.Which gas is released by plants during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Argon
Answer: b) Oxygen
8.Which gas is present in the atmosphere in a quantity of 0.04%?
a) Nitrogen
b) Oxygen
c) Argon
d) Carbon dioxide
Answer: d) Carbon dioxide
9.Which gas in the atmosphere is utilized by plants during photosynthesis?
a) Oxygen
b) Nitrogen
c) Argon
d) Carbon dioxide
Answer: d) Carbon dioxide
10.What environmental issue is caused by the release of gases like carbon monoxide and sulphur dioxide?
a) Global warming
b) Photosynthesis
c) Oxygen depletion
d) Nitrogen cycle
Answer: a) Global warming
11.Who first discovered oxygen in 1772?
a) Joseph Priestley
b) Antoine Lavoisier
c) C.W. Scheele
d) Dmitri Mendeleev
Answer: c) C.W. Scheele
12.What name did C.W. Scheele originally give to oxygen?
a) Acid producer
b) Fire air
c) Vital gas
d) Life air
Answer: b) Fire air
13.Which scientist independently discovered oxygen in 1774?
a) C.W. Scheele
b) Joseph Priestley
c) Antoine Lavoisier
d) Robert Boyle
Answer: b) Joseph Priestley
14.Who named the gas "oxygen"?
a) C.W. Scheele
b) Joseph Priestley
c) Antoine Lavoisier
d) Dmitri Mendeleev
Answer: c) Antoine Lavoisier
15.The Greek word "oxygenes" means
a) Vital gas
b) Acid producer
c) Fire air
d) Life supporter
Answer: b) Acid producer
16.In what year did Antoine Lavoisier name oxygen?
a) 1772
b) 1774
c) 1777
d) 1789
Answer: c) 1777
17.In what form does oxygen primarily exist in the Earth's atmosphere?
a) Ozone (O3)
b) Diatomic molecule (O2)
c) Monatomic oxygen (O)
d) Water (H2O)
Answer: b) Diatomic molecule (O2)
18.Which element is the most abundant in the universe after hydrogen and helium?
a) Nitrogen
b) Carbon
c) Oxygen
d) Neon
Answer: c) Oxygen
19.What is the common name for the triatomic molecule of oxygen (O3)?
a) Oxygen
b) Ozone
c) Silicate
d) Carbon dioxide
Answer: b) Ozone
20.Which of the following gases is denser than air?
a) Hydrogen
b) Helium
c) Oxygen
d) Nitrogen
Answer: c) Oxygen
21.What is the chemical name for rust?
a) Hydrated ferric oxide
b) Ferric chloride
c) Iron sulfate
d) Iron oxide
Answer: a) Hydrated ferric oxide
22.Rust is primarily composed of which of the following?
a) Iron chloride
b) Iron oxide
c) Iron sulfate
d) Iron hydroxide
Answer: b) Iron oxide
23.Oxygen is used in oxy-acetylene cylinders for:
A) Heating
B) Cooling
C) Cutting and welding metals
D) None of the above
Answer: C) Cutting and welding metals
24.Oxygen is used as:
A) Rocket fuel
B) Car fuel
C) Airplane fuel
D) Ship fuel
Answer: A) Rocket fuel
25.When mixed with powdered charcoal, oxygen is used as:
A) Fertilizer
B) Medicine
C) Explosives
D) Paint
Answer: C) Explosives
26.Oxygen is used in the synthesis of:
A) Methane
B) Methanol
C) Ethanol
D) Butane
Answer: B) Methanol
27.Oxygen is used to remove carbon impurities from:
A) Iron
B) Copper
C) Steel
D) Aluminum
Answer: C) Steel
28.Oxygen is used by plants and animals for:
A) Photosynthesis
B) Respiration
C) Digestion
D) Excretion
Answer: B) Respiration
29.Nitrogen was first isolated from the air by:
A) Daniel Rutherford
B) Antoine Lavoisier
C) Joseph Priestley
D) Henry Cavendish
Answer: A) Daniel Rutherford
30.Nitre is a compound of:
A) Nitrogen and oxygen
B) Nitrogen and hydrogen
C) Nitrogen and potassium
D) Nitrogen and carbon
Answer: C) Nitrogen and potassium
31.In what year was nitrogen first isolated from the air?
a) 1772
b) 1789
c) 1802
d) 1821
Answer: a) 1772
32.What does the Greek word "azote" mean in relation to nitrogen?
a) "Life-giver"
b) "No life"
c) "Air producer"
d) "Gas"
Answer: b) "No life"
33.What alternative name for nitrogen did Antoine Lavoisier suggest?
a) Azote
b) Nitrogen
c) Nitre
d) Oxygen
Answer: a) Azote
34.What is the Greek origin of the name "nitrogen"?
a) "Nitron" and "gene"
b) "Azote" and "gene"
c) "Nitre" and "life"
d) "Nitrogen" and "no life"
Answer: a) "Nitron" and "gene"
35.What does the Greek word "nitron" in the name "nitrogen" mean?
a) "Life"
b) "No life"
c) "I produce"
d) "Nitre"
Answer: d) "Nitre"
36.What is the approximate percentage of nitrogen in the mass of the human body?
a) 1%
b) 2%
c) 3%
d) 4%
Answer: c) 3%
37.Where does nitrogen rank in terms of abundance in the universe?
a) Fourth
b) Fifth
c) Sixth
d) Seventh
Answer: d) Seventh
38.What is the composition of the atmosphere on Titan, Saturn's largest moon?
a) 50% Nitrogen
b) 70% Nitrogen
c) 85% Nitrogen
d) 98% Nitrogen
Answer: d) 98% Nitrogen
39.Nitrogen exists in the atmosphere as
a) Mononitrogen (N)
b) Nitric oxide (NO)
c) Dinitrogen (N2)
d) Nitrogen dioxide (NO2)
Answer: c) Dinitrogen (N2)
40.What form of nitrogen is present in volcanic gases?
a) Nitrogen dioxide (NO2)
b) Nitric oxide (NO)
c) Dinitrogen (N2)
d) Nitrogen trichloride (NCl3)
Answer: c) Dinitrogen (N2)
41.Nitre is a compound of:
A) Nitrogen and oxygen
B) Nitrogen and hydrogen
C) Nitrogen and potassium
D) Nitrogen and carbon
Answer: C) Nitrogen and potassium
42.What form does nitrogen take when it freezes?
a) A clear gas
b) A blue liquid
c) A white solid
d) A yellow solid
Answer: c) A white solid
43.Nitrogen is:
A) Acidic to litmus
B) Basic to litmus
C) Neutral to litmus
D) None of the above
Answer: C) Neutral to litmus
44.Liquid nitrogen is used as a:
A) Lubricant
B) Fuel
C) Refrigerant
D) Solvent
Answer: C) Refrigerant
45.Nitrogen is used in the Haber process to produce:
A) Ammonia
B) Nitric acid
C) Methanol
D) Ethanol
Answer: A) Ammonia
46.Nowadays, nitrogen is used as a substitute for:
A) Compressed air in tires
B) Gasoline in cars
C) Natural gas in homes
D) Propane in grills
Answer: A) Compressed air in tires
47.Many explosives, such as TNT and nitroglycerin, contain:
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon
Answer: C) Nitrogen
48.Nitrogen is used in the manufacturing of:
A) Steel
B) Glass
C) Plastic
D) Rubber
Answer: A) Steel
49.Nitrogen is used to reduce:
A) Fire hazards
B) Water pollution
C) Air pollution
D) Soil pollution
Answer: A) Fire hazards
50.Nitrogen is used as part of the gas in:
A) Fluorescent light bulbs
B) Incandescent light bulbs
C) LED light bulbs
D) None of the above
Answer: B) Incandescent light bulbs
51.What is the approximate percentage of carbon dioxide in the air by volume?
a) 0.01%
b) 0.03%
c) 0.05%
d) 0.1%
Answer: b) 0.03%
52.What is a significant natural source of carbon dioxide?
a) Rivers
b) Oceans
c) Volcanoes
d) Forests
Answer: c) Volcanoes
53.What is one effect of the increased carbon dioxide concentration on the planet?
a) Cooling effect
b) Global warming
c) Decreased plant growth
d) Increased rainfall
Answer: b) Global warming
54.What do we call it when a solid turns directly into a vapor?
a) Melting
b) Freezing
c) Sublimation
d) Condensation
Answer: c) Sublimation
55.What is the primary component of Venus' atmosphere?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Methane
Answer: c) Carbon dioxide
56.What percentage of Venus' atmosphere is composed of carbon dioxide?
a) 50-55%
b) 70-75%
c) 85-90%
d) 96-97%
Answer: d) 96-97%
57.What is the approximate surface temperature of Venus?
a) 332°C
b) 392°C
c) 462°C
d) 512°C
Answer: c) 462°C
58.Carbon dioxide is used to prepare:
A) Soft drinks
B) Hard drinks
C) Juices
D) Milk
Answer: A) Soft drinks
59.Carbon dioxide is used in:
A) Fire extinguishers
B) Water sprinklers
C) Smoke detectors
D) None of the above
Answer: A) Fire extinguishers
60.Carbon dioxide is used in the Solvay process to produce:
A) Sodium chloride
B) Sodium hydroxide
C) Sodium carbonate
D) Sodium bicarbonate
Answer: C) Sodium carbonate
61.Dry ice is:
A) Solid carbon dioxide
B) Frozen water
C) A mixture of ice and salt
D) A synthetic material
Answer: A) Solid carbon dioxide
62.Carbon dioxide is used in the manufacture of:
A) Urea
B) Ammonia
C) Methanol
D) Ethanol
Answer: A) Urea
63.Carbon dioxide can be used to preserve:
A) Food grains
B) Fruits
C) Vegetables
D) All of the above
Answer: D) All of the above
64.What is aerated water commonly known as?
a) Sparkling water
b) Soda water
c) Mineral water
d) Distilled water
Answer: b) Soda water
65.What is the main component dissolved in aerated water under pressure?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide
66.Which greenhouse gas is commonly used in air conditioning and refrigeration?
a) Carbon dioxide (CO₂)
b) Methane (CH₄)
c) Nitrous oxide (N₂O)
d) Chlorofluorocarbons (CFCs)
Answer: d) Chlorofluorocarbons (CFCs)
67.Which of the following is not a greenhouse gas?
A) Carbon dioxide (CO2)
B) Nitrogen (N2)
C) Methane (CH4)
D) Chlorofluorocarbons (CFCs)
Answer: B) Nitrogen
68.Greenhouse gases contribute to:
A) Global warming
B) Ozone depletion
C) Acid rain
D) None of the above
Answer: A) Global warming
69.What is the pH of pure rainwater due to the dissolution of atmospheric CO₂?
a) 7.0
b) 6.5
c) 5.6
d) 4.5
Answer: c) 5.6
70.What is the pH level of acid rain?
a) Greater than 7.0
b) Around 6.0
c) Less than 5.6
d) Exactly 7.0
Answer: c) Less than 5.6
71.Which of the following is true about oxygen?
(a) Completely burning gas
(b) Partially burning gas
(c) Doesn’t support burning
(d) Supports burning
Answer:
(d) Supports burning
72.Aerated water contains –
(a) air
(b) oxygen
(c) carbon dioxide
(d) nitrogen
Answer:
(c) carbon dioxide
73.Solvay process is a method to manufacture –
(a) lime water
(b) aerated water
(c) distilled water
(d) sodium carbonate
Answer:
(d) sodium carbonate
74.Carbon dioxide with water changes –
(a) blue litmus to red
(b) red litmus to blue
(c) blue litmus to yellow
(d) doesn’t react with litmus
Answer:
(a) blue litmus to red
75.Which of the following is known as azote?
(a) Oxygen
(b) Nitrogen
(c) Sulphur
(d) Carbon dioxide
Answer:
(b) Nitrogen
76.What is called as vital life?
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Hydrogen
Answer: c) Oxygen
77.Nitrogen is ________ than air.
a) Heavier
b) Lighter
c) The same
d) Variable
Answer: b) Lighter
78._________ is used as a fertilizer.
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrogen
79.Dry ice is used as a _________.
a) Fuel
b) Solvent
c) Refrigerant
d) Lubricant
Answer: c) Refrigerant
80.The process of conversion of iron into hydrated form of oxides is called _________.
a) Oxidation
b) Combustion
c) Rusting
d) Corrosion
Answer: c) Rusting
81.…………… is necessary for all acids.
(a) Nitrogen
(b) CO2
(c) Oxygen
(d) Hydrogen
Answer:
(c) Oxygen
82.Tri oxygen molecule is known as ……………
(a) hydrogen
(b) oxygen
(c) nitrogen
(d) ozone
Answer:
(d) ozone
83.About 78% by volume of air is ……………
(a) Carbon dioxide
(b) Nitrogen
(c) Argon
(d) Oxygen
Answer:
(b) nitrogen
84.Carbon dioxide gas is ……………
(a) heavier than air
(b) lighter than air
(c) as heavy as air
(d) none of these
Answer:
(a) heavier than air
85.A gas which neither burns nor supports burning is …………….
(a) Oxygen
(b) Helium
(c) Hydrogen
(d) Carbon dioxide
Answer:
(d) Carbon dioxide
86.A gas which is used to remove carbon impurities from steel.
(a) Nitrogen
(b) Oxygen
(c) Carbon dioxide
(d) Hydrogen
Answer:
(b) Oxygen
87.Venus atmosphere consists of roughly 96 – 97% of …………….
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) none
Answer:
(c) Carbon dioxide
88.Carbon dioxide gas is …………… in nature.
(a) basic
(b) acidic
(c) sweet
(d) none
Answer:
(b) acidic
89.…………… gas is essential for the proper growth of all plants.
(a) Nitrogen
(b) CO2
(c) Oxygen
(d) none
Answer:
(a) Nitrogen
90.Lighter metals like Na, K combine with CO2 to form corresponding …………….
(a) Nitrates
(b) Carbonates
(c) Oxide
(d) none
Answer:
(b) Carbonates
91.What exists in nature as silicates, carbonates, oxides, and water?
a) Carbon
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b) Oxygen
92.Metals like magnesium, iron, and sodium burn with oxygen and give basic __________.
a) Oxides
b) Acids
c) Peroxides
d) Chlorides
Answer: a) Oxides
93.__________ has a pH less than 5.6.
a) Pure water
b) Acid rain
c) Sea water
d) Tap water
Answer: b) Acid rain
94.CO₂ is used along with __________ in the manufacture of fertilizers like urea.
a) Nitrogen
b) Ammonia
c) Oxygen
d) Methane
Answer: b) Ammonia
95.CO₂, N₂O, CH₄, and CFC are known as __________.
a) Inert gases
b) Greenhouse gases
c) Noble gases
d) Pollutants
Answer: b) Greenhouse gases
96.__________ is used to prepare soft drinks or aerated drinks.
a) Oxygen
b) CO₂
c) Nitrogen
d) Methane
Answer: b) CO₂
.97. __________ is used as a substitute for compressed air in tyres.
a) Hydrogen
b) Nitrogen
c) Oxygen
d) Argon
Answer: b) Nitrogen
98.Liquid nitrogen is used as a __________.
a) Fuel
b) Refrigerant
c) Solvent
d) Lubricant
Answer: b) Refrigerant
99.Oxygen is used to oxidize __________.
a) Metals
b) Rocket fuel
c)Plastics
d) Fertilizers
Answer: b) Rocket fuel
100.Phosphorus burns with a suffocating smell and gives __________.
a) Sulfur dioxide
b) Carbon monoxide
c) Phosphorus pentoxide
d) Nitrogen dioxide
Answer: c) Phosphorus pentoxide
Nitrogen – Fertilizer
Oxygen – Respiration in living animals
Carbon dioxide – Fire extinguisher
Dry ice – Refrigerator
