Chemistry
1. Chemistry is the study of: A) Living organisms B) Matter and its changes C) Energy only D) Motion
Answer: B
2. Matter must have: A) Energy B) Force C) Mass and volume D) Heat Answer: C
3. Which is a physical change? A) Burning paper B) Rusting iron C) Melting ice D) Cooking food Answer: C
4. The smallest unit of an element that retains its properties is: A) Molecule B) Atom C) Ion D) Compound
Answer: B
5. Atoms combine to form: A) Elements B) Compounds C) Mixtures D) Molecules Answer: D
6. An element cannot be broken down by: A) Chemical means B) Physical means C) Nuclear reaction D)
None Answer: B
7. Which is an element? A) Water B) Salt C) Oxygen D) Air Answer: C
8. Noble gases are in group: A) 1 B) 2 C) 17 D) 18 Answer: D
9. A solution with pH > 7 is: A) Acidic B) Basic C) Neutral D) Salt Answer: B
10. Baking soda formula is: A) NaCl B) NaHCO₃ C) Na₂CO₃ D) CaCO₃ Answer: B
11. The atomic number is the number of: A) Protons B) Neutrons C) Electrons D) Particles Answer: A
12. Elements in the same period have the same number of: A) Valence electrons B) Shells C) Protons D)
Chemical properties Answer: B
13. Most abundant gas in air is: A) Oxygen B) Carbon dioxide C) Nitrogen D) Hydrogen Answer: C
14. The least reactive metal among these is: A) Copper B) Zinc C) Iron D) Gold Answer: D
15. Metals typically form: A) Anions B) Cations C) Molecules D) Radicals Answer: B
16. Non‑metals usually form: A) Cations B) Anions C) Molecules D) None Answer: B
17. An element with atomic number 10 is: A) Carbon B) Neon C) Sodium D) Oxygen Answer: B
18. Alkali metals are in group: A) 1 B) 2 C) 17 D) 18 Answer: A
19. Halogens are found in group: A) 1 B) 2 C) 17 D) 16 Answer: C
20. Transition metals are found in: A) s‑block B) p‑block C) d‑block D) f‑block Answer: C
21. Ionic compounds are formed by: A) Sharing electrons B) Gaining electrons C) Attraction of ions D) Metallic
bonding Answer: C
22. Covalent bond involves: A) Transfer of electrons B) Sharing of electrons C) Ion formation D) Nuclear
reaction Answer: B
23. A coordinate bond is another name for: A) Covalent bond B) Ionic bond C) Dative bond D) Metallic bond
Answer: C
24. The molecule O₂ has a: A) Single bond B) Double bond C) Triple bond D) Ionic bond Answer: B
25. A molecule with triple bond example: A) CO₂ B) H₂O C) N₂ D) CH₄ Answer: C
26. Hybridization in CH₄ is: A) sp B) sp² C) sp³ D) dsp² Answer: C
27. Electronegativity increases: A) Down a group B) Across a period C) Both D) None Answer: B
28. The shape of NH₃ is: A) Linear B) Bent C) Trigonal pyramidal D) Square planar Answer: C
29. The VSEPR model predicts: A) Reactions B) Structure of molecules C) Atomic mass D) Color Answer: B
30. Metallic bond involves: A) Electron sharing B) Electron sea model C) Ionic attraction D) Covalent bond
Answer: B
31. Law of conservation of mass was proposed by: A) Dalton B) Lavoisier C) Boyle D) Newton Answer: B
32. A balanced equation means: A) Molecules equal B) Atoms equal on both sides C) Charges equal D) Mass
equal Answer: B
33. A catalyst: A) Slows reaction B) Speeds up reaction C) Is consumed D) Absorbs product Answer: B
34. Endothermic reactions: A) Release heat B) Absorb heat C) Produce light D) Create mass Answer: B
35. Oxidation involves: A) Gain of electrons B) Loss of electrons C) Gain of neutrons D) Loss of protons
Answer: B
36. Reduction involves: A) Gain of electrons B) Loss of electrons C) Gain of protons D) Loss of neutrons
Answer: A
37. Redox reactions always involve: A) Only oxidation B) Only reduction C) Both oxidation & reduction D) No
electron transfer Answer: C
38. When solution pH < 7 it is: A) Acidic B) Basic C) Neutral D) Salt Answer: A
39. Electrolysis involves: A) Electrical energy to chemical change B) Chemical energy only C) Heat energy D)
Nuclear energy Answer: A
40. Law of definite proportions deals with: A) Reaction rates B) Composition of compounds C) Gas laws D)
Solubility Answer: B
41. Gas molecules move: A) Slowly B) Randomly C) In order D) Not at all Answer: B
42. Boyle’s law relates: A) P and V B) T and V C) P and T D) V and n Answer: A
43. Charles’s law relates volume to: A) Pressure B) Temperature C) Mass D) Density Answer: B
44. In ideal gas equation PV=nRT, R is: A) Gas constant B) Pressure C) Volume D) Temperature Answer: A
45. Solution concentration can be expressed as: A) Molarity B) Molality C) Normality D) All of the above
Answer: D
46. Colligative properties depend on: A) Solvent nature B) Solute amount C) Solute type D) Temperature only
Answer: B
47. Osmosis is movement of solvent from: A) High solute to low solute B) Low solvent to high solvent C) Low
solute to high solute D) High solute to low solute Answer: C
48. Boiling point elevation is a: A) Colligative property B) Physical change C) Chemical reaction D)
Electrolysis Answer: A
49. Raoult’s law applies to: A) Pure liquids B) Solutions C) Gases D) Solids Answer: B
50. Vapor pressure decreases with: A) Temp up B) Nonvolatile solute C) Adding heat D) Reducing solute
Answer: B
51. Activation energy is energy required to: A) Finish reaction B) Initiate reaction C) Form products D) Break
products Answer: B
52. Rate of reaction increases with: A) Lower temp B) Higher concentration C) More solvent D) Solid only
Answer: B
53. Catalyst lowers: A) Activation energy B) Product energy C) Reactant energy D) Heat required Answer: A
54. Endothermic reactions absorb: A) Heat B) Light C) Sound D) Electricity Answer: A
55. Exothermic reactions release: A) Heat B) Cold C) Mass D) Gas Answer: A
56. Rate law expresses rate as a function of: A) Concentrations B) Volume C) Time only D) Pressure Answer:
A
57. Half‑life refers to time taken for: A) Reaction start B) Half reactant to convert C) All products form D)
Temperature change Answer: B
58. Order of reaction depends on: A) Mechanism B) Pressure C) Volume D) Catalyst only Answer: A
59. Zero‑order reaction rate is independent of: A) Temperature B) Pressure C) Concentration D) Volume
Answer: C
60. In first‑order reaction half‑life is: A) Constant B) Variable C) Infinite D) Zero Answer: A
61. Electrolytes conduct due to: A) Electrons B) Ions C) Molecules D) Neutrons Answer: B
62. A cathode is where: A) Oxidation occurs B) Reduction occurs C) Heat generated D) Light emitted
Answer: B
63. pH of neutral water at 25 °C is: A) 6 B) 7 C) 8 D) 0 Answer: B
64. A Bronsted acid: A) Electron donor B) Proton donor C) Proton acceptor D) Electron acceptor Answer: B
65. A Bronsted base: A) Proton donor B) Electron acceptor C) Proton acceptor D) Electron donor Answer: C
66. Buffer solutions resist change in: A) Color B) pH C) Temp D) Volume Answer: B
67. Salt of strong acid & strong base is: A) Acidic B) Basic C) Neutral D) Depends Answer: C
68. Conductivity increases with: A) Lower temp B) Higher ion concentration C) Less ions D) More solvent
Answer: B
69. Electrochemical cell converts: A) Chemical to heat B) Chemical to electric C) Electric to light D) Heat to
chemical Answer: B
70. Faraday’s laws relate: A) Mass of substance and charge B) Temp and volume C) Pressure and temp D)
Area and volume Answer: A
71. Organic chemistry primarily studies: A) Metals B) Carbon compounds C) Acids D) Bases Answer: B
72. Methane is: A) Alkene B) Alkyne C) Alkane D) Aromatic Answer: C
73. Which has double bond? A) Ethane B) Ethene C) Ethyne D) Methane Answer: B
74. Isomerism means: A) Same structure B) Same formula different structure C) Different formula same
structure D) None Answer: B
75. Functional group in alcohol is: A) –OH B) –COOH C) –NH₂ D) =O Answer: A
76. Chirality occurs in: A) Linear molecule B) Molecules with asymmetric carbon C) Ionic compounds D)
Metals Answer: B
77. Benzene is an example of: A) Alkane B) Aromatic C) Alkyne D) Aldehyde Answer: B
78. Addition reactions occur with: A) Alkanes B) Alkenes C) Alkynes D) Both B & C Answer: D
79. Substitution reactions are typical for: A) Alkanes B) Alkenes C) Aromatics D) None Answer: C
80. Polymerization is the process of: A) Splitting monomers B) Combining monomers C) Forming ions D)
Neutralization Answer: B
81. Hydrolysis of ester yields: A) Alcohol and acid B) Water only C) Alcohol only D) Acid only Answer: A
82. Proteins are polymers of: A) Nucleotides B) Amino acids C) Monosaccharides D) Fatty acids Answer: B
83. Carbohydrates provide: A) Energy B) Structure C) Enzymes D) Hormones Answer: A
84. Lipids are: A) Water soluble B) Organic compounds C) Inorganic D) Metals Answer: B
85. DNA stands for: A) Deoxyribonucleic acid B) Ribonucleic acid C) Deoxyribose acid D) None Answer: A
86. RNA helps in: A) Protein synthesis B) Energy production C) DNA replication only D) Ion transport Answer:
A
87. Vitamins are: A) Minerals B) Organic micronutrients C) Proteins D) Fats Answer: B
88. Enzymes are: A) Carbohydrates B) Proteins C) Lipids D) Nucleic acids Answer: B
89. pKa is measure of: A) Acid strength B) Base strength C) Solubility D) Density Answer: A
90. Functional group in aldehyde is: A) –OH B) –CHO C) –COOH D) –NH₂ Answer: B
91. Titration helps find: A) Mass B) Concentration C) Temp D) Volume only Answer: B
92. Hard water contains: A) Mg²⁺ and Ca²⁺ B) Na⁺ C) K⁺ D) Cl⁻ Answer: A
93. Soap cleans by: A) Dissolving dirt B) Emulsification C) Freezing dirt D) Electrode action Answer: B
94. Rusting of iron is: A) Oxidation B) Reduction C) Redox D) Neutral Answer: C
95. Metal that resists corrosion is: A) Iron B) Gold C) Zinc D) Copper Answer: B
96. Chromatography separates: A) Mixtures B) Pure substances C) Elements only D) Isotopes Answer: A
97. Electroplating uses: A) Electrolysis B) Distillation C) Filtration D) Sublimation Answer: A
98. Distillation separates: A) Immiscible liquids B) Miscible liquids C) Solids D) Gases Answer: B
99. Indicator changes: A) Temp B) Color with pH C) Volume D) Pressure Answer: B
100. Common salt is: A) NaOH B) NaCl C) KCl D) CaCO₃ Answer: B
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