Chemistry is a branch of science that studies the composition, structure, properties, and changes of matter. It plays a crucial role in our everyday lives, from the air we breathe to the food we eat. This article presents 100 chemistry general knowledge questions and answers, perfect for students, quiz enthusiasts, and learners interested in understanding the wonders of chemistry.
Chemistry General Knowledge Quiz
1. What is the chemical formula of water?
a) H₂O
b) CO₂
c) NaCl
d) CH₄
Answer: H₂O
2. What is the atomic number of hydrogen?
a) 1
b) 2
c) 3
d) 4
Answer: 1
3. Which gas is known as “laughing gas”?
a) Nitrogen
b) Nitrous Oxide
c) Methane
d) Helium
Answer: Nitrous Oxide
4. What is the pH level of pure water?
a) 5
b) 6
c) 7
d) 8
Answer: 7
5. Which chemical element has the symbol ‘O’?
a) Oxygen
b) Osmium
c) Oganesson
d) Osmium Dioxide
Answer: Oxygen
6. Which acid is commonly found in vinegar?
a) Acetic Acid
b) Citric Acid
c) Hydrochloric Acid
d) Sulfuric Acid
Answer: Acetic Acid
7. What is the lightest element in the periodic table?
a) Helium
b) Hydrogen
c) Lithium
d) Beryllium
Answer: Hydrogen
8. What is the chemical formula for table salt?
a) NaCl
b) KCl
c) MgCl₂
d) HCl
Answer: NaCl
9. Which element is known as the “King of Chemicals”?
a) Sulfuric Acid
b) Hydrochloric Acid
c) Nitric Acid
d) Acetic Acid
Answer: Sulfuric Acid
10. What is the periodic table?
a) A chart of elements
b) A calendar
c) A chemical equation
d) A lab apparatus
Answer: A chart of elements
11. What is the common name for solid carbon dioxide?
a) Dry Ice
b) Baking Soda
c) Washing Soda
d) Carbonic Acid
Answer: Dry Ice
12. Which gas is used in balloons to make them float?
a) Helium
b) Hydrogen
c) Oxygen
d) Carbon Dioxide
Answer: Helium
13. Which metal is liquid at room temperature?
a) Mercury
b) Gallium
c) Sodium
d) Lead
Answer: Mercury
14. What is the pH of a neutral solution?
a) 0
b) 7
c) 14
d) 10
Answer: 7
15. What is the main component of natural gas?
a) Methane
b) Ethane
c) Propane
d) Butane
Answer: Methane
16. What does the term “atom” mean in Greek?
a) Indivisible
b) Small
c) Energy
d) Matter
Answer: Indivisible
17. Which acid is known as the “King of Acids”?
a) Sulfuric Acid
b) Hydrochloric Acid
c) Nitric Acid
d) Phosphoric Acid
Answer: Sulfuric Acid
18. Which element is known as the “Metal of the Future”?
a) Titanium
b) Aluminum
c) Lithium
d) Carbon
Answer: Titanium
19. What is the chemical name of baking soda?
a) Sodium Bicarbonate
b) Sodium Carbonate
c) Calcium Carbonate
d) Potassium Carbonate
Answer: Sodium Bicarbonate
20. Which element has the highest atomic number?
a) Oganesson
b) Uranium
c) Thorium
d) Einsteinium
Answer: Oganesson
21. What is the most abundant gas in Earth’s atmosphere?
a) Nitrogen
b) Oxygen
c) Carbon Dioxide
d) Argon
Answer: Nitrogen
22. What is the chemical formula for rust?
a) Fe₂O₃
b) FeO
c) FeSO₄
d) FeCl₃
Answer: Fe₂O₃
23. What is the hardest natural substance on Earth?
a) Diamond
b) Graphite
c) Quartz
d) Topaz
Answer: Diamond
24. Which gas is essential for the process of photosynthesis?
a) Oxygen
b) Carbon Dioxide
c) Nitrogen
d) Hydrogen
Answer: Carbon Dioxide
25. Which type of bond is formed by sharing electrons?
a) Covalent Bond
b) Ionic Bond
c) Metallic Bond
d) Hydrogen Bond
Answer: Covalent Bond
26. Which element is commonly used in making batteries?
a) Lithium
b) Lead
c) Nickel
d) Zinc
Answer: Lithium
27. Which gas is known as “Marsh Gas”?
a) Methane
b) Ethane
c) Propane
d) Butane
Answer: Methane
28. What is the chemical symbol for gold?
a) Au
b) Ag
c) Fe
d) Pb
Answer: Au
29. Which element is a major component of the sun?
a) Hydrogen
b) Helium
c) Oxygen
d) Carbon
Answer: Hydrogen
30. Which acid is present in lemon?
a) Citric Acid
b) Acetic Acid
c) Hydrochloric Acid
d) Sulfuric Acid
Answer: Citric Acid
31. What is the term for a substance that speeds up a chemical reaction?
a) Catalyst
b) Reactant
c) Product
d) Inhibitor
Answer: Catalyst
32. Which metal is the best conductor of electricity?
a) Silver
b) Copper
c) Gold
d) Aluminum
Answer: Silver
33. What is the study of chemical processes in living organisms called?
a) Biochemistry
b) Organic Chemistry
c) Physical Chemistry
d) Analytical Chemistry
Answer: Biochemistry
34. Which gas is used in the process of welding?
a) Acetylene
b) Oxygen
c) Hydrogen
d) Nitrogen
Answer: Acetylene
35. What is the common name for calcium sulfate dihydrate?
a) Gypsum
b) Limestone
c) Chalk
d) Marble
Answer: Gypsum
36. Which element is responsible for the red color in fireworks?
a) Strontium
b) Barium
c) Sodium
d) Potassium
Answer: Strontium
37. What is the chemical formula for ammonia?
a) NH₃
b) NH₄
c) NO₃
d) N₂H₄
Answer: NH₃
38. Which element is the most abundant in the Earth’s crust?
a) Oxygen
b) Silicon
c) Aluminum
d) Iron
Answer: Oxygen
39. What is the process of converting a liquid to a gas called?
a) Evaporation
b) Condensation
c) Sublimation
d) Precipitation
Answer: Evaporation
40. Which type of chemical reaction releases energy?
a) Exothermic Reaction
b) Endothermic Reaction
c) Neutralization Reaction
d) Oxidation Reaction
Answer: Exothermic Reaction
41. Which metal is used to galvanize iron?
a) Zinc
b) Aluminum
c) Copper
d) Tin
Answer: Zinc
42. What is the main ingredient in glass?
a) Silica
b) Lime
c) Soda Ash
d) Alumina
Answer: Silica
43. Which gas is used in soft drinks?
a) Carbon Dioxide
b) Nitrogen
c) Oxygen
d) Helium
Answer: Carbon Dioxide
44. What is the chemical formula for sulfuric acid?
a) H₂SO₄
b) HCl
c) HNO₃
d) H₃PO₄
Answer: H₂SO₄
45. Which element has the highest melting point?
a) Tungsten
b) Iron
c) Carbon
d) Platinum
Answer: Tungsten
46. What is the most abundant element in the universe?
a) Hydrogen
b) Helium
c) Oxygen
d) Carbon
Answer: Hydrogen
47. Which element is commonly used in thermometers?
a) Mercury
b) Gallium
c) Lead
d) Zinc
Answer: Mercury
48. What is the chemical name of washing soda?
a) Sodium Carbonate
b) Sodium Bicarbonate
c) Calcium Carbonate
d) Potassium Carbonate
Answer: Sodium Carbonate
49. Which type of bond is formed by the transfer of electrons?
a) Ionic Bond
b) Covalent Bond
c) Hydrogen Bond
d) Metallic Bond
Answer: Ionic Bond
50. Which gas is responsible for the greenhouse effect?
a) Carbon Dioxide
b) Nitrogen
c) Oxygen
d) Hydrogen
Answer: Carbon Dioxide
51. What is the chemical formula for ethanol?
a) C₂H₅OH
b) CH₄
c) C₆H₆
d) C₂H₂
Answer: C₂H₅OH
52. Which chemical element is represented by the symbol ‘K’?
a) Krypton
b) Potassium
c) Calcium
d) Sodium
Answer: Potassium
53. What is the process of a solid directly converting to a gas called?
a) Sublimation
b) Condensation
c) Evaporation
d) Precipitation
Answer: Sublimation
54. Which acid is commonly found in the stomach?
a) Hydrochloric Acid
b) Sulfuric Acid
c) Nitric Acid
d) Acetic Acid
Answer: Hydrochloric Acid
55. Which chemical element is the primary component of diamonds?
a) Carbon
b) Silicon
c) Nitrogen
d) Oxygen
Answer: Carbon
56. Which element is known as “Quick Silver”?
a) Mercury
b) Silver
c) Lead
d) Zinc
Answer: Mercury
57. What is the pH of a basic solution?
a) Greater than 7
b) Equal to 7
c) Less than 7
d) Exactly 0
Answer: Greater than 7
58. Which element is used as a catalyst in the hydrogenation of oils?
a) Nickel
b) Platinum
c) Palladium
d) Copper
Answer: Nickel
59. Which gas turns limewater milky?
a) Carbon Dioxide
b) Oxygen
c) Hydrogen
d) Nitrogen
Answer: Carbon Dioxide
60. Which element is commonly used in fireworks to produce a green color?
a) Barium
b) Strontium
c) Sodium
d) Copper
Answer: Barium
61. Which acid is used in car batteries?
a) Sulfuric Acid
b) Hydrochloric Acid
c) Nitric Acid
d) Acetic Acid
Answer: Sulfuric Acid
62. What is the main component of LPG (Liquefied Petroleum Gas)?
a) Propane and Butane
b) Methane and Ethane
c) Hydrogen and Nitrogen
d) Oxygen and Helium
Answer: Propane and Butane
63. Which element is used in the making of semiconductors?
a) Silicon
b) Copper
c) Lead
d) Zinc
Answer: Silicon
64. What is the chemical symbol for lead?
a) Pb
b) Ld
c) Le
d) Pl
Answer: Pb
65. Which gas is produced during the reaction of an acid with a metal?
a) Hydrogen
b) Oxygen
c) Carbon Dioxide
d) Nitrogen
Answer: Hydrogen
66. What is the main element in the alloy brass?
a) Copper and Zinc
b) Copper and Tin
c) Aluminum and Magnesium
d) Iron and Carbon
Answer: Copper and Zinc
67. Which compound is known as “Caustic Soda”?
a) Sodium Hydroxide
b) Potassium Hydroxide
c) Calcium Hydroxide
d) Magnesium Hydroxide
Answer: Sodium Hydroxide
68. Which metal is extracted from bauxite ore?
a) Aluminum
b) Iron
c) Copper
d) Zinc
Answer: Aluminum
69. Which gas is commonly known as “Wood Gas”?
a) Carbon Monoxide
b) Methane
c) Ethylene
d) Propane
Answer: Carbon Monoxide
70. What is the process of separating a mixture by boiling and condensation called?
a) Distillation
b) Filtration
c) Decantation
d) Chromatography
Answer: Distillation
71. What is the chemical name for bleaching powder?
a) Calcium Hypochlorite
b) Sodium Hypochlorite
c) Calcium Carbonate
d) Calcium Oxide
Answer: Calcium Hypochlorite
72. Which element is used in making filaments for light bulbs?
a) Tungsten
b) Copper
c) Aluminum
d) Nickel
Answer: Tungsten
73. Which chemical is responsible for the pungent smell of onions?
a) Sulfur Compounds
b) Acetic Acid
c) Amino Acids
d) Carbon Compounds
Answer: Sulfur Compounds
74. Which process is used to extract pure metals from their ores?
a) Smelting
b) Filtration
c) Electrolysis
d) Crystallization
Answer: Smelting
75. Which element is present in the chlorophyll of plants?
a) Magnesium
b) Iron
c) Calcium
d) Zinc
Answer: Magnesium
76. What is the chemical symbol for iron?
a) Fe
b) Ir
c) In
d) I
Answer: Fe
77. Which gas is known as the “Silent Killer”?
a) Carbon Monoxide
b) Carbon Dioxide
c) Methane
d) Nitrogen
Answer: Carbon Monoxide
78. Which acid is found in ant stings?
a) Formic Acid
b) Acetic Acid
c) Citric Acid
d) Lactic Acid
Answer: Formic Acid
79. What is the main constituent of cement?
a) Lime
b) Silica
c) Alumina
d) Gypsum
Answer: Lime
80. Which chemical is known as “Epsom Salt”?
a) Magnesium Sulfate
b) Sodium Chloride
c) Potassium Nitrate
d) Calcium Carbonate
Answer: Magnesium Sulfate
81. Which element is used in thermometers but is being replaced due to toxicity?
a) Mercury
b) Gallium
c) Lead
d) Zinc
Answer: Mercury
82. Which element is used as a disinfectant in swimming pools?
a) Chlorine
b) Bromine
c) Fluorine
d) Iodine
Answer: Chlorine
83. What is the pH range of acidic solutions?
a) Less than 7
b) Equal to 7
c) Greater than 7
d) Between 7 and 14
Answer: Less than 7
84. Which gas is released when baking soda reacts with vinegar?
a) Carbon Dioxide
b) Oxygen
c) Hydrogen
d) Nitrogen
Answer: Carbon Dioxide
85. Which metal is used in making aircraft due to its lightweight?
a) Aluminum
b) Iron
c) Copper
d) Titanium
Answer: Aluminum
86. Which element is commonly used in fertilizers to supply nitrogen?
a) Ammonia
b) Urea
c) Nitrate
d) Potash
Answer: Urea
87. What is the main component of gunpowder?
a) Potassium Nitrate
b) Sodium Nitrate
c) Ammonium Nitrate
d) Calcium Nitrate
Answer: Potassium Nitrate
88. Which gas is used in neon signs for its reddish-orange glow?
a) Neon
b) Argon
c) Helium
d) Xenon
Answer: Neon
89. Which element is used in the manufacturing of matches?
a) Phosphorus
b) Sulfur
c) Magnesium
d) Potassium
Answer: Phosphorus
90. What is the chemical name for lime water?
a) Calcium Hydroxide
b) Calcium Oxide
c) Calcium Carbonate
d) Calcium Sulfate
Answer: Calcium Hydroxide
91. Which gas is responsible for the ozone layer depletion?
a) Chlorofluorocarbons (CFCs)
b) Carbon Dioxide
c) Methane
d) Oxygen
Answer: Chlorofluorocarbons (CFCs)
92. Which element is used in the production of nuclear energy?
a) Uranium
b) Thorium
c) Plutonium
d) Radium
Answer: Uranium
93. Which chemical compound is known as “Plaster of Paris”?
a) Calcium Sulfate Hemihydrate
b) Calcium Carbonate
c) Sodium Sulfate
d) Magnesium Sulfate
Answer: Calcium Sulfate Hemihydrate
94. What is the primary gas found in LPG?
a) Propane
b) Methane
c) Hydrogen
d) Carbon Dioxide
Answer: Propane
95. Which process is used to separate petroleum into different components?
a) Fractional Distillation
b) Chromatography
c) Filtration
d) Evaporation
Answer: Fractional Distillation
96. Which element is used in the vulcanization of rubber?
a) Sulfur
b) Phosphorus
c) Silicon
d) Zinc
Answer: Sulfur
97. Which compound is commonly known as “Caustic Potash”?
a) Potassium Hydroxide
b) Sodium Hydroxide
c) Calcium Hydroxide
d) Magnesium Hydroxide
Answer: Potassium Hydroxide
98. Which gas is produced during respiration in humans?
a) Carbon Dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: Carbon Dioxide
99. Which element is used in making solar cells?
a) Silicon
b) Selenium
c) Cadmium
d) Gallium
Answer: Silicon
100. What is the chemical formula of ozone?
a) O₃
b) O₂
c) H₂O
d) CO₂
Answer: O₃
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