Chemistry MCQs – Set 15: Advanced Questions for UPSC/PCS Exam Prep

  1. Which of the following is used to manufacture soap?
    (A) Glycerol
    (B) Sodium hydroxide
    (C) Sodium bicarbonate
    (D) Sodium chloride
    Answer: (B)
  2. Which acid is present in vinegar?
    (A) Acetic acid
    (B) Formic acid
    (C) Citric acid
    (D) Oxalic acid
    Answer: (A)
  3. Which of the following shows sublimation?
    (A) Sodium
    (B) Ammonium chloride
    (C) Copper sulfate
    (D) Sugar
    Answer: (B)
  4. Which of the following is a p-block element?
    (A) Sodium
    (B) Magnesium
    (C) Chlorine
    (D) Calcium
    Answer: (C)
  5. Which gas is collected by upward displacement of air?
    (A) Hydrogen
    (B) Oxygen
    (C) Ammonia
    (D) Carbon dioxide
    Answer: (C)
  6. Which of the following is not an allotrope of carbon?
    (A) Diamond
    (B) Graphite
    (C) Charcoal
    (D) Silicon
    Answer: (D)
  7. Which of the following has a metallic bond?
    (A) H₂
    (B) O₂
    (C) Na
    (D) CO₂
    Answer: (C)
  8. Which of the following is a basic oxide?
    (A) CO₂
    (B) NO₂
    (C) CaO
    (D) SO₃
    Answer: (C)
  9. Which of the following solutions has the highest pH?
    (A) Distilled water
    (B) Vinegar
    (C) Lime water
    (D) Lemon juice
    Answer: (C)
  10. The pH value of lemon juice is approximately –
    (A) 2
    (B) 4
    (C) 6
    (D) 7
    Answer: (A)
  11. Which of the following elements is used in firecrackers for red color?
    (A) Barium
    (B) Strontium
    (C) Sodium
    (D) Potassium
    Answer: (B)
  12. The solubility of gases in liquids increases with –
    (A) Increase in temperature
    (B) Increase in pressure
    (C) Decrease in pressure
    (D) Decrease in solute
    Answer: (B)
  13. Which vitamin is water-soluble?
    (A) Vitamin A
    (B) Vitamin D
    (C) Vitamin B-complex
    (D) Vitamin E
    Answer: (C)
  14. The shape of the methane molecule is –
    (A) Linear
    (B) Angular
    (C) Trigonal planar
    (D) Tetrahedral
    Answer: (D)
  15. Which of the following is responsible for ozone depletion?
    (A) CO
    (B) CH₄
    (C) SO₂
    (D) CFCs
    Answer: (D)
  16. Which method is used to separate cream from milk?
    (A) Filtration
    (B) Evaporation
    (C) Centrifugation
    (D) Decantation
    Answer: (C)
  17. Which of these gases is used in soda water?
    (A) CO₂
    (B) O₂
    (C) N₂
    (D) H₂
    Answer: (A)
  18. Which of these ions is responsible for water hardness?
    (A) Na⁺
    (B) Ca²⁺
    (C) H⁺
    (D) K⁺
    Answer: (B)
  19. Which organic acid is found in curd?
    (A) Acetic acid
    (B) Lactic acid
    (C) Citric acid
    (D) Oxalic acid
    Answer: (B)
  20. Which compound is commonly known as laughing gas?
    (A) NO
    (B) N₂O
    (C) CO
    (D) SO₂
    Answer: (B)
  21. Which of the following can act as both acid and base?
    (A) NaOH
    (B) HCl
    (C) NH₃
    (D) H₂O
    Answer: (D)
  22. Which of the following is the lightest element?
    (A) Helium
    (B) Hydrogen
    (C) Lithium
    (D) Neon
    Answer: (B)
  23. Which compound gives fruity smell?
    (A) Ester
    (B) Acid
    (C) Ketone
    (D) Alcohol
    Answer: (A)
  24. Which element has the highest electronegativity?
    (A) Oxygen
    (B) Fluorine
    (C) Chlorine
    (D) Sulfur
    Answer: (B)
  25. Which of the following has a triple bond?
    (A) Ethane
    (B) Ethene
    (C) Ethyne
    (D) Benzene
    Answer: (C)
  26. Which process is used to purify water using membranes?
    (A) Distillation
    (B) Filtration
    (C) Reverse osmosis
    (D) Sedimentation
    Answer: (C)
  27. Which gas is used in glowing advertising signs?
    (A) Argon
    (B) Krypton
    (C) Neon
    (D) Helium
    Answer: (C)
  28. The main component of glass is –
    (A) Sodium carbonate
    (B) Calcium carbonate
    (C) Silica
    (D) Limestone
    Answer: (C)
  29. Which of the following is a linear molecule?
    (A) CH₄
    (B) CO₂
    (C) H₂O
    (D) NH₃
    Answer: (B)
  30. What is the common name of CH₃COOH?
    (A) Formic acid
    (B) Acetic acid
    (C) Oxalic acid
    (D) Lactic acid
    Answer: (B)
  31. Which of the following has the lowest boiling point?
    (A) Water
    (B) Ether
    (C) Ethanol
    (D) Methanol
    Answer: (B)
  32. Which substance has a characteristic fishy odor?
    (A) Amine
    (B) Ester
    (C) Alcohol
    (D) Acid
    Answer: (A)
  33. Which among the following is a non-polar covalent molecule?
    (A) H₂O
    (B) NH₃
    (C) CH₄
    (D) HCl
    Answer: (C)
  34. Which group contains noble gases?
    (A) Group 17
    (B) Group 18
    (C) Group 1
    (D) Group 16
    Answer: (B)
  35. Which of these is a green house gas?
    (A) Oxygen
    (B) Nitrogen
    (C) Methane
    (D) Argon
    Answer: (C)
  36. The atomic number of silicon is –
    (A) 12
    (B) 13
    (C) 14
    (D) 15
    Answer: (C)
  37. Which of these is a disinfectant in drinking water?
    (A) Baking soda
    (B) Bleaching powder
    (C) Washing soda
    (D) Sodium hydroxide
    Answer: (B)
  38. Which element is used to make semiconductors?
    (A) Iron
    (B) Zinc
    (C) Silicon
    (D) Calcium
    Answer: (C)
  39. Which of these is an alcohol?
    (A) CH₃CHO
    (B) CH₃OH
    (C) CH₃COOH
    (D) CH₃CN
    Answer: (B)
  40. Which element is present in all acids?
    (A) Oxygen
    (B) Nitrogen
    (C) Hydrogen
    (D) Carbon
    Answer: (C)
  41. Which of the following is a thermosetting plastic?
    (A) PVC
    (B) Bakelite
    (C) Polythene
    (D) Teflon
    Answer: (B)
  42. Which of these is a neutral oxide?
    (A) CO
    (B) CO₂
    (C) SO₂
    (D) CaO
    Answer: (A)
  43. Which metal gives violet flame in flame test?
    (A) Sodium
    (B) Calcium
    (C) Potassium
    (D) Barium
    Answer: (C)
  44. Which of the following is used in beauty products as an astringent?
    (A) Acetone
    (B) Glycerol
    (C) Alum
    (D) Formalin
    Answer: (C)
  45. Which part of soap molecule dissolves in grease?
    (A) Ionic end
    (B) Non-polar hydrocarbon chain
    (C) COOH group
    (D) OH group
    Answer: (B)
  46. Which of the following gases is used for sterilizing medical equipment?
    (A) Nitrogen
    (B) Ethylene oxide
    (C) Hydrogen
    (D) Ammonia
    Answer: (B)
  47. Which of these compounds is a carboxylic acid?
    (A) CH₃COOH
    (B) CH₃OH
    (C) CH₄
    (D) CH₃COCH₃
    Answer: (A)
  48. What is the nature of aqueous solution of Na₂CO₃?
    (A) Neutral
    (B) Acidic
    (C) Basic
    (D) Amphoteric
    Answer: (C)
  49. Which of these metals is used in fusion reactions?
    (A) Lithium
    (B) Uranium
    (C) Thorium
    (D) Plutonium
    Answer: (A)
  50. Which of the following elements is found in proteins but not carbohydrates?
    (A) Hydrogen
    (B) Nitrogen
    (C) Oxygen
    (D) Carbon
    Answer: (B)
Tags: , , , , , , , ,

Leave a Reply