Prepare for exams with Chemistry PKMCQs with answers on Pak MCQs forum. Ideal for NTS, FPSC, PPSC, and ETEA, these solved MCQs cover essential chemistry topics. Start practicing today!
Chemistry PKMCQs with Answers – Pak MCQs Forum:
1. The smallest particle of an element that retains its chemical properties is called:
a) Molecule
b) Atom ✅
c) Ion
d) Proton
2. The atomic number of an element represents the number of:
a) Electrons
b) Neutrons
c) Protons ✅
d) Nucleons
3. The atomic mass of an element is the sum of:
a) Protons and electrons
b) Electrons and neutrons
c) Protons and neutrons ✅
d) Only protons
4. The horizontal rows in the periodic table are called:
a) Groups
b) Periods ✅
c) Families
d) Series
5. The vertical columns in the periodic table are called:
a) Groups ✅
b) Periods
c) Rows
d) Series
6. The most abundant gas in the Earth's atmosphere is:
a) Oxygen
b) Carbon dioxide
c) Nitrogen ✅
d) Argon
7. The element with atomic number 1 is:
a) Oxygen
b) Hydrogen ✅
c) Helium
d) Lithium
8. Which of the following is an alkaline earth metal?
a) Sodium
b) Calcium ✅
c) Potassium
d) Lithium
9. The number of naturally occurring elements is approximately:
a) 100
b) 92 ✅
c) 118
d) 150
10. Which gas is used in balloons because it is lighter than air?
a) Oxygen
b) Hydrogen
c) Helium ✅
d) Carbon dioxide
11. Water is a:
a) Element
b) Compound ✅
c) Mixture
d) Solution
12. The pH scale measures:
a) Temperature
b) Acidity and alkalinity ✅
c) Density
d) Conductivity
13. A solution with a pH of 7 is:
a) Acidic
b) Basic
c) Neutral ✅
d) Highly reactive
14. The most electronegative element is:
a) Oxygen
b) Fluorine ✅
c) Chlorine
d) Nitrogen
15. The lightest metal is:
a) Aluminum
b) Sodium
c) Lithium ✅
d) Magnesium
16. The process by which a liquid turns into gas is called:
a) Condensation
b) Evaporation ✅
c) Freezing
d) Sublimation
17. Which of the following is a noble gas?
a) Oxygen
b) Nitrogen
c) Argon ✅
d) Hydrogen
18. The process of solid changing directly to gas is called:
a) Melting
b) Sublimation ✅
c) Condensation
d) Freezing
19. The chemical formula of methane is:
a) CH3
b) CH4 ✅
c) C2H6
d) CO2
20. The element used in making pencil leads is:
a) Carbon ✅
b) Lead
c) Iron
d) Zinc
21. Which gas is responsible for the greenhouse effect?
a) Oxygen
b) Nitrogen
c) Carbon dioxide ✅
d) Hydrogen
22. The most reactive non-metal is:
a) Oxygen
b) Fluorine ✅
c) Chlorine
d) Sulfur
23. The chemical symbol for gold is:
a) Go
b) Ag
c) Au ✅
d) Pb
24. Rusting of iron is an example of:
a) Reduction
b) Oxidation ✅
c) Neutralization
d) Sublimation
25. Which acid is found in lemons?
a) Acetic acid
b) Citric acid ✅
c) Sulfuric acid
d) Hydrochloric acid
26. The chemical formula of sulfuric acid is:
a) HCl
b) H₂SO₄ ✅
c) HNO₃
d) H₂CO₃
27. The metal that reacts violently with water is:
a) Copper
b) Sodium ✅
c) Iron
d) Zinc
28. The process of coating iron with zinc to prevent rusting is called:
a) Galvanization ✅
b) Electroplating
c) Rustproofing
d) Anodizing
29. The gas used in soft drinks is:
a) Oxygen
b) Carbon dioxide ✅
c) Hydrogen
d) Nitrogen
30. The most abundant element in the universe is:
a) Oxygen
b) Helium
c) Hydrogen ✅
d) Carbon
31. The process of breaking down a compound using electricity is called:
a) Electrolysis ✅
b) Sublimation
c) Condensation
d) Evaporation
32. The metal present in chlorophyll is:
a) Iron
b) Magnesium ✅
c) Calcium
d) Copper
33. Which element is a liquid at room temperature?
a) Oxygen
b) Mercury ✅
c) Sodium
d) Carbon
34. The metal found in blood hemoglobin is:
a) Zinc
b) Iron ✅
c) Calcium
d) Copper
35. The main gas in LPG (Liquefied Petroleum Gas) is:
a) Methane
b) Propane
c) Butane ✅
d) Ethane
36. The chemical name of baking soda is:
a) Sodium carbonate
b) Sodium bicarbonate ✅
c) Calcium carbonate
d) Ammonium chloride
37. The hardest naturally occurring substance is:
a) Graphite
b) Quartz
c) Diamond ✅
d) Gold
38. The process by which plants release oxygen is called:
a) Photosynthesis ✅
b) Respiration
c) Transpiration
d) Fermentation
39. The gas responsible for the depletion of the ozone layer is:
a) Oxygen
b) Carbon monoxide
c) Chlorofluorocarbons (CFCs) ✅
d) Hydrogen sulfide
40. The metal used in making aircraft bodies is:
a) Copper
b) Aluminum ✅
c) Zinc
d) Lead
41. The metal used in thermometers is:
a) Lead
b) Mercury ✅
c) Zinc
d) Iron
42. The chemical name of quicklime is:
a) Calcium hydroxide
b) Calcium carbonate
c) Calcium oxide ✅
d) Calcium sulfate
43. The substance used in making glass is:
a) Silica ✅
b) Limestone
c) Sodium chloride
d) Clay
44. The gas produced when metals react with acids is:
a) Oxygen
b) Carbon dioxide
c) Hydrogen ✅
d) Nitrogen
45. The metal that is a good conductor of electricity is:
a) Iron
b) Copper ✅
c) Lead
d) Zinc
46. The gas used in welding is:
a) Hydrogen
b) Oxygen
c) Acetylene ✅
d) Helium
47. Which polymer is used for making plastic bottles?
a) Polystyrene
b) Polyethylene ✅
c) Polyvinyl chloride
d) Nylon
48. The noble gas used in neon signs is:
a) Argon
b) Neon ✅
c) Krypton
d) Helium
49. The chemical formula of ozone is:
a) O
b) O₂
c) O₃ ✅
d) O₄
50. The metal extracted from bauxite ore is:
a) Copper
b) Iron
c) Aluminum ✅
d) Zinc
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