100 One-Liner GK Facts from Class X Science – Chapter I : Chemical Substances

🧪 100 One-Liner GK Facts from Class X Science – Unit I: Chemical Substances

Are you a Class X student or competitive exam aspirant looking to master the science chapters easily? Here’s a power-packed list of 100 one-liner General Knowledge facts from Unit I – Chemical Substances: Nature & Behaviour based on the NCERT syllabus. These cover important concepts from four key chapters: Chemical Reactions and Equations, Acids, Bases and Salts, Metals and Non‑metals, and Carbon and Its Compounds.


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🔬 Chapter 1: Chemical Reactions and Equations (25 Facts)

1. A chemical reaction transforms reactants into products.


2. Bubbles in a reaction may indicate gas evolution.


3. Color change is often a sign of a chemical change.


4. Rusting of iron is a slow oxidation reaction.


5. The rusting equation is: 4Fe + 3O₂ + 6H₂O → 4Fe(OH)₃.


6. A balanced chemical equation has equal atoms on both sides.


7. Combustion reactions release heat and light.


8. Magnesium ribbon burns to form magnesium oxide.


9. Photosynthesis is an endothermic reaction.


10. Respiration is an exothermic reaction.


11. Decomposition breaks a compound into simpler ones.


12. Electrolysis of water is a decomposition reaction.


13. Displacement reactions swap elements in compounds.


14. Zinc displaces copper from copper sulphate.


15. Double displacement reactions may form precipitates.


16. BaCl₂ + Na₂SO₄ → BaSO₄ (white ppt) + NaCl.


17. Corrosion slowly damages metals through oxidation.


18. Rancidity is fat oxidation in food.


19. Oxidation adds oxygen or removes hydrogen.


20. Reduction adds hydrogen or removes oxygen.


21. Redox reactions involve both oxidation and reduction.


22. Mass is conserved in balanced equations.


23. Lime water turns milky with CO₂.


24. Energy may be absorbed or released in reactions.


25. Heat, light, or electricity can start chemical reactions.




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🧪 Chapter 2: Acids, Bases, and Salts (25 Facts)

26. Acids are sour and turn blue litmus red.


27. Bases are bitter and turn red litmus blue.


28. HCl in the stomach helps in digestion.


29. NaOH and KOH are strong bases.


30. Indicators detect acidic/basic nature by color change.


31. Phenolphthalein is colorless in acid, pink in base.


32. Litmus is a natural indicator from lichens.


33. Universal indicator shows pH through multiple colors.


34. pH scale ranges from 0 (acid) to 14 (base).


35. pH less than 7 indicates an acidic solution.


36. pH 7 is neutral.


37. pH greater than 7 is basic.


38. Tooth decay starts when mouth pH falls below 5.5.


39. Antacids neutralize excess acid in the stomach.


40. Acids react with metals to produce hydrogen gas.


41. Bases like NaOH also release hydrogen with metals.


42. Acids + Carbonates → Salt + Water + CO₂.


43. Salt is the product of acid-base neutralization.


44. NaCl is made from HCl + NaOH.


45. Strong acids dissociate fully in water.


46. Baking soda = sodium hydrogen carbonate.


47. Washing soda = sodium carbonate decahydrate.


48. Plaster of Paris = calcium sulphate hemihydrate.


49. Acids and bases conduct electricity in solution.


50. Acid rain has pH below 5.6.




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🛠️ Chapter 3: Metals and Non‑Metals (25 Facts)

51. Metals conduct heat and electricity well.


52. Non-metals are poor conductors (except graphite).


53. Metals are malleable and ductile.


54. Non-metals are brittle.


55. Sodium and potassium are soft metals.


56. Mercury is liquid at room temperature.


57. Iron reacts with steam to form iron oxide.


58. Zinc + HCl → ZnCl₂ + H₂.


59. Copper doesn’t react with dilute HCl.


60. Metals form basic oxides.


61. Non-metals form acidic oxides.


62. Rusting = Iron + O₂ + H₂O → Iron Oxide.


63. Gold and platinum are unreactive.


64. More reactive metals displace less reactive ones.


65. Electrolysis is used to extract highly reactive metals.


66. Carbon reduction is used for moderately reactive metals.


67. Heating is enough for low reactive metals.


68. Alloys are mixtures of metals or metals with non-metals.


69. Bronze = Copper + Tin.


70. Stainless steel = Iron + Chromium + Nickel.


71. Chlorine purifies drinking water.


72. Sulphur and phosphorus are non-metal fertilizers.


73. Carbon forms millions of compounds.


74. Iodine is an antiseptic non-metal.


75. Metalloids have properties of metals and non-metals.




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🧬 Chapter 4: Carbon and Its Compounds (25 Facts)

76. Carbon forms covalent bonds by sharing electrons.


77. Covalent bonds don’t produce ions.


78. Carbon compounds have low melting points.


79. Carbon compounds are generally non-conductors.


80. CH₄ (methane) is the simplest hydrocarbon.


81. Ethane and propane are saturated hydrocarbons.


82. Alkenes have double bonds (e.g., C₂H₄).


83. Alkynes have triple bonds (e.g., C₂H₂).


84. Isomers have the same formula but different structures.


85. Ethanol is used in sanitizers and beverages.


86. Acetic acid is vinegar (CH₃COOH).


87. Esters smell fruity and are used in perfumes.


88. Soaps are sodium or potassium salts of fatty acids.


89. Detergents are synthetic cleaning agents.


90. Soap forms micelles in hard water.


91. Catenation is carbon’s ability to form chains.


92. Combustion of carbon compounds releases energy.


93. Diamond and graphite are carbon allotropes.


94. Diamond is the hardest known substance.


95. Graphite conducts electricity.


96. Benzene has a ring structure with 6 carbon atoms.


97. CCl₄ is a carbon compound used in cleaning.


98. CFCs damage the ozone layer.


99. Polymers are large molecules made from carbon chains.


100. Life on Earth is based on carbon chemistry.




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📝 Conclusion:

These 100 one-liner facts are your quick-reference toolkit for revision, quiz prep, and science Olympiads. Share this post with friends and let the power of smart science learning begin!


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