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Chemistry MCQs

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Subject Preparation Guide

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

Atomic StructureChemical BondingReactionsOrganic Chemistry
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Which of these is an example of a physical change?

  • A Burning wood
  • B Rusting iron
  • C Baking a cake
  • D Melting ice
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Correct Answer: Option D — Melting ice
Explanation: Melting ice is a physical change because the water molecules remain chemically the same; only the state changes from solid to liquid. Burning, rusting, and baking all involve chemical reactions that form new substances.
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What is the name given to positively charged ions?

  • A Anions
  • B Cations
  • C Isotopes
  • D Isomers
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Correct Answer: Option B — Cations
Explanation: Cations are positively charged ions formed when an atom loses one or more electrons. They are attracted to the cathode, or negative electrode, during electrolysis and commonly include metal ions such as sodium and calcium.
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