Chemistry
Chemistry GK – Questions & Answer
Chemistry is the science that studies matter, elements, compounds, and chemical reactions. These basic Chemistry GK questions help improve scientific knowledge and are useful for students, quizzes, and competitive exams.
Practice questions 1-25
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1. Who is known as the Father of Modern Chemistry? – Antoine Lavoisier
2. What is the lightest element in the periodic table? – Hydrogen
3. What is the chemical symbol of gold? – Au
4. Which gas is essential for respiration? – Oxygen
5. The atomic number of carbon is? – 6
6. Which acid is found in lemon? – Citric Acid
7. What is the common name of sodium chloride? – Common Salt
8. What is the pH value of pure water? – 7 (Neutral)
9. Which gas is known as laughing gas? – Nitrous Oxide (N₂O)
10. What is the chemical symbol of iron? – Fe
11. Which metal is liquid at room temperature? – Mercury
12. Which element is necessary for the formation of hemoglobin? – Iron
13. What is the hardest natural substance on Earth? – Diamond
14. Which gas is used in fire extinguishers? – Carbon Dioxide (CO₂)
15. What is the chemical symbol for lead? – Pb
16. Who proposed the atomic theory? – John Dalton
17. Which element has the highest electronegativity? – Fluorine
18. What is the chemical name of washing soda? – Sodium Carbonate (Na₂CO₃)
19. What is the atomic number of oxygen? – 8
20. Which element is used in pencils? – Carbon (Graphite)
21. Which element is used in making thermometers? – Mercury
22. The noble gases are found in which group of the periodic table? – Group 18
23. Which gas turns limewater milky? – Carbon Dioxide
24. Which is the most abundant element in Earth’s crust? –
Oxygen
25. What is the main component of natural gas? – Methane (CH₄)
Practice questions 26-45
26. Which gas is used in balloons? – Helium
27. What is the chemical symbol of silver? – Ag
28. Which acid is present in vinegar? – Acetic Acid
29. What is the chemical formula of ozone? – O₃
30. Which gas is produced during photosynthesis? – Oxygen
31. Which metal is the best conductor of electricity? – Silver
32. Which chemical is called quicklime? – Calcium Oxide (CaO)
33. What is the chemical symbol of potassium? – K
34. Which gas is known as marsh gas? – Methane (CH₄)
35. Which element is used in fluorescent lamps? – Argon
36. Which acid is used in car batteries? – Sulfuric Acid
37. What is the chemical symbol of sodium? – Na
38. Which element is known as the “King of Chemicals”? – Sulfuric Acid
39. What is the chemical symbol of copper? – Cu
40. Which metal is used for making aircraft bodies? – Aluminium
41. Which is the heaviest naturally occurring element? – Uranium
42. Which element has the chemical symbol Zn? – Zinc
43. Which element is used in nuclear reactors as fuel? – Uranium
44. Which acid is called the “King of Chemicals”? – Sulfuric Acid
45. Which element is used in making semiconductor devices? – Silicon
Practice questions 46-65
46. What is the chemical symbol of calcium? – Ca
47. Which element is called the “building block of life”? – Carbon
48. Which gas is commonly known as “dry ice”? – Solid carbon dioxide
49. What is the atomic number of hydrogen? – 1
50. Which gas is known as “water gas”? – Carbon monoxide + Hydrogen mixture
51. What is the atomic number of helium? – 2
52. What is the chemical formula of ammonia? – NH₃
53. Which gas is used for welding? – Acetylene
54. Which element has the symbol Sn? – Tin
55. What is the molecular formula of glucose? – C₆H₁₂O₆
56. Which gas is used to preserve food items? – Nitrogen
57. Which element is called the “metal of the future”? – Titanium
58. Which chemical element is liquid at room temperature other than mercury? – Bromine
59. What is the chemical formula of sulfuric acid? – H₂SO₄
60. Which gas is known as “soda water gas”? – Carbon dioxide
61. Which element has the chemical symbol Mg? – Magnesium
62. Which element has the atomic number 79? – Gold
63. What is the chemical formula of table sugar? – C₁₂H₂₂O₁₁ (Sucrose)
64. Which gas is known as “coal gas”? – Methane, Hydrogen, Carbon monoxide
mixture
65. Which is the lightest metal? – Lithium
Practice questions 66-85
66. Which element has the atomic number 26? – Iron (Fe)
67. What is the chemical formula of baking soda? – NaHCO₃
68. Which element is called quicksilver? – Mercury
69. What is the chemical symbol of phosphorus? – P
70. Which gas is used in the manufacture of fertilizers? – Ammonia
71. What is the atomic number of neon? – 10
72. Which metal is used for galvanization? – Zinc
73. Which gas is used in soda water? – Carbon dioxide
74. Which element has the atomic number 17? – Chlorine
75. Which gas is used for ripening of fruits? – Ethylene
76. What is the chemical symbol of lead? – Pb
77. Which gas is known as “poisonous gas” from incomplete combustion? – Carbon monoxide (CO)
78. Which element is called the “green element” because of its eco-friendly uses? – Hydrogen
79. Which is the most abundant gas in the Sun? – Hydrogen
89. Which gas is called “tear gas”? – Chloropicrin
81. What is the chemical symbol of uranium? – U
82. Which is the lightest noble gas? – Helium
83. Which metal is used in making railway tracks? – Steel (Iron + Carbon alloy)
84. Which element has the atomic number 92? – Uranium
85. Which element has the atomic number 82? – Lead
Practice questions 86-105
86. Which element is called the “king of metals”? – Gold
87. Which gas is called laughing gas? – Nitrous oxide (N₂O)
88. Which is the lightest element? – Hydrogen
89. Which element is the best conductor of electricity? – Silver
90. What is the atomic number of oxygen? – 8
91. Which gas is used in fire extinguishers? – Carbon dioxide
92. Which element is used in pencils? – Carbon (Graphite)
93. Which acid is found in vinegar? – Acetic acid
94. Which gas is known as marsh gas? – Methane (CH₄)
95. Which is the heaviest naturally occurring element? – Uranium
96. Which gas is responsible for acid rain? – Sulfur dioxide (SO₂)
97. Which element is known as “fool’s gold”? – Iron pyrite
98. Which acid is used in car batteries? – Sulfuric acid
99. Which element is liquid at room temperature other than mercury? – Bromine
100. Which element has the highest atomic number in the periodic table (as of 2025)? – Oganesson (Og, 118)
101. Which chemical is used to purify drinking water? – Chlorine
102. Which is the most reactive metal? – Francium
103. Which is the most reactive non-metal? – Fluorine
104. Which element is essential in hemoglobin? – Iron
105. Which metal is used to make airplanes? – Aluminium
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