Chapters and topics
- Fundamentals of Chemistry 3 topics · 287 MCQs
- Atomic Structure 5 topics · 247 MCQs
- Gases 9 topics · 129 MCQs
- Liquids 5 topics · 137 MCQs
- Solids 5 topics · 119 MCQs
- Chemical Equilibrium 6 topics · 206 MCQs
- Reaction Kinetics 4 topics · 196 MCQs
- Thermochemistry and Energetics of Chemical Reactions 7 topics · 166 MCQs
- Electrochemistry 4 topics · 205 MCQs
- Chemical Bonding 7 topics · 220 MCQs
- S- and P-Block Elements 5 topics · 373 MCQs
- Transition Elements 1 topic · 162 MCQs
- Fundamental Principles of Organic Chemistry 4 topics · 129 MCQs
- Chemistry of Hydrocarbons 16 topics · 229 MCQs
- Alkyl Halides 2 topics · 135 MCQs
- Alcohols and Phenols 3 topics · 153 MCQs
- Aldehydes and Ketones 4 topics · 168 MCQs
- Carboxylic Acids 3 topics · 202 MCQs
- Macromolecules 5 topics · 192 MCQs
- Industrial Chemistry 5 topics · 136 MCQs
- Environmental Chemistry 3 topics · 93 MCQs
Sample Chemistry MCQs
Try these questions, then open the full practice to work through every chapter. Tap “Show the answer” after you choose.
Q1. Avogadro's number is the number of molecules present in:
- 1 dm³ of CH₄
- 1 g of formula mass
- 1 g of atom
- Gram molecular mass
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Answer: D. Gram molecular mass
One gram-molecular mass (one mole) contains N_A molecules.
Q2. Which of the following is the correct trend of energy of the given subshells: 4p, 3d, 5s, 4f?
- 3d < 4p < 4f < 5s
- 3d < 4f < 4p < 5s
- 3d < 4p < 5s < 4f
- 3d < 5s < 4p < 4f
Show the answer
Answer: C. 3d < 4p < 5s < 4f
By the (n + l) rule: 3d(5) < 4p(5) < 5s(5) < 4f(7), with ties broken by lower n.
Q3. Which thermodynamic temperature is equivalent to 501.85°C?
- 228.85 K
- 775.00 K
- 774.85 K
- 228.70 K
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Answer: B. 775.00 K
K = °C + 273.15 = 775.00.
Q4. Choose the compound in which hydrogen bonding is not possible:
- H2O
- CH3COOH
- HCl
- CH3CH2OH
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Answer: C. HCl
Cl is not electronegative and small enough to form hydrogen bonds.
Q5. Which one of the following characteristics is not usually attributed to ionic substances?
- High melting points
- Fragility
- Crystalline
- Deform when struck
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Answer: D. Deform when struck
Ionic crystals are brittle and shatter rather than deform.
Q6. The ratio of K_c/K_p for the reaction N₂ + 3H₂ ⇌ 2NH₃ is:
- (RT)^(1/2)
- 1
- (RT)^(−1/2)
- (RT)²
Show the answer
Answer: D. (RT)²
K_p = K_c(RT)^Δn with Δn = −2, so K_c/K_p = (RT)².
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