Chapters and topics
- Atomic Structure 3 topics · 359 MCQs
- Chemical Bonding 2 topics · 219 MCQs
- Stoichiometry 2 topics · 206 MCQs
- States of Matter: Liquids and Solids 1 topic · 108 MCQs
- Chemical Energetics 2 topics · 214 MCQs
- Reaction Kinetics 1 topic · 105 MCQs
- Chemical Equilibrium 1 topic · 110 MCQs
- Acids, Bases and Ionic Equilibria 2 topics · 206 MCQs
- Periodicity 1 topic · 140 MCQs
- Halogens, Nitrogen, Sulfur and the Environment 2 topics · 229 MCQs
- Organic Fundamentals and Hydrocarbons 2 topics · 236 MCQs
- Halogenoalkanes and Alcohols 2 topics · 202 MCQs
- Carbonyls, Carboxylic Acids, Esters and Amines 2 topics · 204 MCQs
Sample Chemistry MCQs
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Q1. In a mass spectrometer, the lighter ions are deflected:
- not at all
- less
- more
- equally
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Answer: C. more
The correct answer is “more”. Deflection depends on m/z.
Q2. Water has an unusually high boiling point for its size because of:
- ionic bonds
- extensive hydrogen bonding
- London forces only
- metallic bonding
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Answer: B. extensive hydrogen bonding
The correct answer is “extensive hydrogen bonding”. Energy needed to break H-bonds.
Q3. The theoretical yield of a product is 10 g but only 7.5 g is obtained. The percentage yield is:
- 133%
- 25%
- 75%
- 7.5%
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Answer: C. 75%
% yield = actual/theoretical × 100 = 7.5/10 × 100 = 75%.
Q4. A/An cleavage plane is/refers to:
- a state with the flow of a liquid and some order of a crystal
- the characteristic external shape in which a crystal grows
- different substances having the same crystal structure
- a plane along which a crystal breaks cleanly into smooth faces
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Answer: D. a plane along which a crystal breaks cleanly into smooth faces
Cleavage plane: a plane along which a crystal breaks cleanly into smooth faces.
Q5. Which of these processes is endothermic?
- condensation of steam
- neutralization of HCl with NaOH
- respiration of glucose
- dissolving NH₄NO₃ in water (cold packs)
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Answer: D. dissolving NH₄NO₃ in water (cold packs)
The dissolving NH₄NO₃ in water (cold packs) is endothermic.
Q6. What is a curve showing how molecular energies are spread in a sample of gas?
- Boltzmann distribution
- rate of reaction
- order of reaction
- rate constant (k)
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Answer: A. Boltzmann distribution
Boltzmann distribution: a curve showing how molecular energies are spread in a sample of gas.
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