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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.

Atomic StructureChemical BondingReactionsOrganic Chemistry
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Hard nts Uploaded: 06 Aug 2026

What is the oxidation state of oxygen in most compounds?

  • A -2
  • B -1
  • C +1
  • D +2
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Correct Answer: Option A — -2
Explanation: Oxygen typically has an oxidation state of -2 in most of its compounds, as it tends to gain two electrons to complete its outer shell. Exceptions include peroxides, where oxygen has an oxidation state of -1.
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Hard nts Uploaded: 06 Aug 2026

What is the term for elements with the same number of protons but different numbers of neutrons?

  • A Allotropes
  • B Isomers
  • C Isobars
  • D Isotopes
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Correct Answer: Option D — Isotopes
Explanation: Isotopes are variants of an element that share the same atomic number but differ in mass number due to varying neutron counts. Carbon-12 and Carbon-14 are common examples of isotopes used in dating and research.
Submitted by: PaperMCQs
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