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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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What is the chemical formula for bleaching powder used in water purification?

  • A Ca(OH)2
  • B CaCO3
  • C Ca(OCl)Cl
  • D CaCl2
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Correct Answer: Option C — Ca(OCl)Cl
Explanation: Bleaching powder is calcium hypochlorite chloride Ca(OCl)Cl made by passing chlorine gas over slaked lime and used as a disinfectant and bleaching agent.
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Which element is the most abundant in the universe?

  • A Hydrogen
  • B Helium
  • C Carbon
  • D Oxygen
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Correct Answer: Option A — Hydrogen
Explanation: Hydrogen is the most abundant element in the universe making up approximately 75 percent of all normal matter by mass and is the primary fuel for nuclear fusion in stars.
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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which process converts sugar into alcohol and carbon dioxide using yeast?

  • A Distillation
  • B Hydrogenation
  • C Saponification
  • D Fermentation
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Correct Answer: Option D — Fermentation
Explanation: Fermentation is the anaerobic process by which yeast converts sugars into ethanol and carbon dioxide producing alcoholic beverages and is also used in bread making.
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