Chemistry MCQs – Set 8: Advanced Questions for UPSC/PCS Exam Prep

  1. Which of the following is used to make pencils?
    (A) Lead
    (B) Graphite
    (C) Coal
    (D) Charcoal
    Answer: (B)
  2. Which process is used for separation of pigments?
    (A) Filtration
    (B) Chromatography
    (C) Sublimation
    (D) Decantation
    Answer: (B)
  3. Which acid is present in tomato?
    (A) Citric acid
    (B) Oxalic acid
    (C) Acetic acid
    (D) Tartaric acid
    Answer: (B)
  4. The chemical name of vitamin C is –
    (A) Citric acid
    (B) Tartaric acid
    (C) Ascorbic acid
    (D) Acetic acid
    Answer: (C)
  5. Which one of the following is an ore of iron?
    (A) Bauxite
    (B) Hematite
    (C) Galena
    (D) Malachite
    Answer: (B)
  6. Which of the following is not a property of bases?
    (A) Bitter taste
    (B) Slippery touch
    (C) Turns red litmus blue
    (D) Reacts with metal to form H₂
    Answer: (D)
  7. Which gas is known as tear gas?
    (A) CO₂
    (B) CH₄
    (C) CCl₃NO₂
    (D) Cl₂
    Answer: (C)
  8. Which of the following substances is used in matchstick tips?
    (A) Red phosphorus
    (B) Yellow phosphorus
    (C) White phosphorus
    (D) Black phosphorus
    Answer: (A)
  9. Which of the following is an allotrope of carbon?
    (A) Silica
    (B) Sand
    (C) Graphite
    (D) Marble
    Answer: (C)
  10. Which indicator gives red color in acidic medium and yellow in basic?
    (A) Litmus
    (B) Methyl orange
    (C) Phenolphthalein
    (D) Bromothymol blue
    Answer: (B)
  11. Which gas is filled in fire extinguishers?
    (A) O₂
    (B) CO₂
    (C) N₂
    (D) H₂
    Answer: (B)
  12. Which oxide shows both acidic and basic behavior?
    (A) Na₂O
    (B) SO₂
    (C) Al₂O₃
    (D) CO₂
    Answer: (C)
  13. Soda lime is a mixture of –
    (A) NaOH and Ca(OH)₂
    (B) NaOH and CaO
    (C) NaOH and CaCO₃
    (D) Na₂CO₃ and CaO
    Answer: (B)
  14. The color of iodine vapors is –
    (A) Colorless
    (B) Yellow
    (C) Violet
    (D) Green
    Answer: (C)
  15. Which gas is produced when baking soda is heated?
    (A) H₂
    (B) CO
    (C) CO₂
    (D) O₂
    Answer: (C)
  16. Which chemical is used to bleach hair?
    (A) Hydrogen peroxide
    (B) Sodium hydroxide
    (C) Sodium chloride
    (D) Calcium oxide
    Answer: (A)
  17. The SI unit of pressure is –
    (A) mmHg
    (B) bar
    (C) Pascal
    (D) atm
    Answer: (C)
  18. Which chemical is known as ‘oil of vitriol’?
    (A) HCl
    (B) H₂SO₄
    (C) HNO₃
    (D) CH₃COOH
    Answer: (B)
  19. The process of coating iron with zinc is called –
    (A) Galvanization
    (B) Alloying
    (C) Electroplating
    (D) Soldering
    Answer: (A)
  20. Which of these is a macromolecule?
    (A) Glucose
    (B) Water
    (C) Protein
    (D) CO₂
    Answer: (C)
  21. The metal used in X-ray screens is –
    (A) Zinc
    (B) Tungsten
    (C) Barium
    (D) Lead
    Answer: (C)
  22. Which of the following is a reducing sugar?
    (A) Sucrose
    (B) Glucose
    (C) Cellulose
    (D) Starch
    Answer: (B)
  23. Which metal is extracted from bauxite?
    (A) Zinc
    (B) Copper
    (C) Iron
    (D) Aluminum
    Answer: (D)
  24. The functional group –COOH is known as –
    (A) Alcohol
    (B) Aldehyde
    (C) Carboxylic acid
    (D) Ketone
    Answer: (C)
  25. CNG mainly consists of –
    (A) Propane
    (B) Ethane
    (C) Methane
    (D) Butane
    Answer: (C)
  26. The salt used to preserve meat is –
    (A) NaCl
    (B) NaNO₂
    (C) Na₂CO₃
    (D) CaCl₂
    Answer: (B)
  27. Which of the following is insoluble in water?
    (A) NaCl
    (B) KNO₃
    (C) AgCl
    (D) NaNO₃
    Answer: (C)
  28. Aromatic hydrocarbons contain –
    (A) Single bonds
    (B) Double bonds only
    (C) Benzene ring
    (D) Carboxyl group
    Answer: (C)
  29. Which acid is used in car batteries?
    (A) Acetic acid
    (B) Sulfuric acid
    (C) Nitric acid
    (D) Citric acid
    Answer: (B)
  30. The electronic configuration of neon is –
    (A) 1s² 2s² 2p⁶
    (B) 1s² 2s² 2p⁵
    (C) 1s² 2s² 2p⁴
    (D) 1s² 2s² 2p³
    Answer: (A)
  31. A solution with pH = 1 is –
    (A) Weakly acidic
    (B) Neutral
    (C) Strongly acidic
    (D) Strongly basic
    Answer: (C)
  32. Which of the following is a covalent compound?
    (A) NaCl
    (B) MgCl₂
    (C) HCl
    (D) CaCl₂
    Answer: (C)
  33. The polymer of glucose is –
    (A) Fructose
    (B) Cellulose
    (C) Ethanol
    (D) Methane
    Answer: (B)
  34. Which of the following is a Lewis base?
    (A) HCl
    (B) NH₃
    (C) BF₃
    (D) AlCl₃
    Answer: (B)
  35. Which of the following is a volatile liquid?
    (A) Water
    (B) Ether
    (C) Oil
    (D) Honey
    Answer: (B)
  36. Which of the following is a greenhouse gas?
    (A) O₂
    (B) N₂
    (C) CH₄
    (D) Ar
    Answer: (C)
  37. Which is the main component of vinegar?
    (A) Oxalic acid
    (B) Citric acid
    (C) Acetic acid
    (D) Ascorbic acid
    Answer: (C)
  38. Which metal is used in making filaments of electric bulbs?
    (A) Iron
    (B) Copper
    (C) Tungsten
    (D) Platinum
    Answer: (C)
  39. The gas evolved on reaction of sodium with water is –
    (A) CO₂
    (B) O₂
    (C) H₂
    (D) N₂
    Answer: (C)
  40. Which of the following is a metal?
    (A) Sulfur
    (B) Chlorine
    (C) Sodium
    (D) Oxygen
    Answer: (C)
  41. Which non-metal is essential for combustion?
    (A) Hydrogen
    (B) Nitrogen
    (C) Oxygen
    (D) Carbon
    Answer: (C)
  42. Which element is used in making semiconductors?
    (A) Lead
    (B) Copper
    (C) Silicon
    (D) Iron
    Answer: (C)
  43. Milk is an example of –
    (A) Solution
    (B) Suspension
    (C) Colloid
    (D) Element
    Answer: (C)
  44. Which of the following is used to make antiseptic solution?
    (A) Iodine
    (B) Bromine
    (C) Fluorine
    (D) Chlorine
    Answer: (A)
  45. Which of the following has lowest pH?
    (A) Lemon juice
    (B) Vinegar
    (C) HCl
    (D) Baking soda
    Answer: (C)
  46. The metal used in thermometers is –
    (A) Copper
    (B) Lead
    (C) Mercury
    (D) Zinc
    Answer: (C)
  47. The number of valence electrons in chlorine is –
    (A) 5
    (B) 6
    (C) 7
    (D) 8
    Answer: (C)
  48. The gas used for inflating balloons is –
    (A) Oxygen
    (B) Hydrogen
    (C) Helium
    (D) Nitrogen
    Answer: (C)
  49. Which of the following is a polyatomic ion?
    (A) Cl⁻
    (B) SO₄²⁻
    (C) Na⁺
    (D) K⁺
    Answer: (B)
  50. Which of the following is used in manufacture of fertilizers?
    (A) Nitrogen
    (B) Phosphorus
    (C) Potassium
    (D) All of the above
    Answer: (D)
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