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Chemistry MCQs

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Hard css fpsc ppsc Uploaded: 14 Jul 2026

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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122
Medium ppsc Uploaded: 07 Aug 2026

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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123
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

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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124
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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125
Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical name for baking soda commonly used in cooking?

  • A Sodium hydroxide
  • B Sodium carbonate
  • C Sodium chloride
  • D Sodium bicarbonate
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Correct Answer: Option D — Sodium bicarbonate
Explanation: Baking soda is sodium bicarbonate NaHCO3 which releases carbon dioxide gas when heated or mixed with acid causing baked goods to rise during cooking.
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