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Chemistry MCQs

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Practice the essential concepts of matter, atomic structure, chemical reactions, bonding and everyday applications of chemistry.

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What is the density of pure water at 4°C?

  • A 2.0 g/cm3
  • B 0.5 g/cm3
  • C 1.0 g/cm3
  • D 1.5 g/cm3
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Correct Answer: Option C — 1.0 g/cm3
Explanation: Pure water reaches its maximum density of 1.0 g/cm3 at 4°C, which is used as the reference standard for specific gravity measurements. This unique property causes ice to float since it is less dense than liquid water.
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Which law states that matter can neither be created nor destroyed?

  • A Law of Conservation of Mass
  • B Law of Multiple Proportions
  • C Avogadro's Law
  • D Law of Definite Proportions
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Correct Answer: Option A — Law of Conservation of Mass
Explanation: The Law of Conservation of Mass, formulated by Antoine Lavoisier, states that mass remains constant in a closed system during a chemical reaction. This principle underlies all stoichiometric calculations in chemistry.
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What is the term for a substance that speeds up a reaction without being consumed?

  • A Reactant
  • B Solvent
  • C Product
  • D Catalyst
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Correct Answer: Option D — Catalyst
Explanation: A catalyst increases the rate of a chemical reaction by lowering the activation energy required, without being permanently altered or consumed in the process. Catalysts are widely used in industrial and biological reactions.
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What is the chemical formula for glucose?

  • A C6H12O6
  • B C12H22O11
  • C C6H6O6
  • D C6H10O5
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Correct Answer: Option A — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6, making it a simple sugar and vital energy source for living organisms. It is produced during photosynthesis and broken down in cellular respiration to release energy.
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