Chemistry
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
Important questions and their answers related to natural science.
Earth Science & Astronomy
Chemistry
Physics
Biology..........๐
