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Chemistry MCQs

110 Questions Subject Test
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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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101
Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for silver?

  • A Si
  • B Ag
  • C Sr
  • D Sn
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Correct Answer: Option B — Ag
Explanation: The chemical symbol for silver is Ag derived from the Latin word Argentum and silver is a precious metal with the highest electrical and thermal conductivity of all metals.
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102
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the SI unit of the amount of substance in chemistry?

  • A Gram
  • B Litre
  • C Kilogram
  • D Mole
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Correct Answer: Option D — Mole
Explanation: The Mole is the SI unit for the amount of substance and one mole of any substance contains approximately 6.022 x 10 to the power 23 particles.
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103
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the name of the process by which a liquid changes to a gas at its boiling point?

  • A Vaporisation
  • B Sublimation
  • C Condensation
  • D Freezing
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Correct Answer: Option A — Vaporisation
Explanation: Vaporisation is the process by which a liquid changes to a gas at its boiling point when sufficient thermal energy overcomes the intermolecular forces holding liquid molecules together.
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104
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.
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105
Medium nts Uploaded: 07 Aug 2026

Which element is known for forming the largest number of compounds?

  • A Hydrogen
  • B Oxygen
  • C Carbon
  • D Nitrogen
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Correct Answer: Option C — Carbon
Explanation: Carbon forms the largest number of compounds among all elements due to its ability to bond with itself and other elements in chains, rings, and branched structures, forming the foundation of organic chemistry.
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106
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for methane, the main component of natural gas?

  • A C2H6
  • B CH4
  • C C3H8
  • D C2H4
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Correct Answer: Option B — CH4
Explanation: Methane has the chemical formula CH4 consisting of one carbon atom bonded to four hydrogen atoms and is the simplest alkane and the primary component of natural gas.
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107
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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108
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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109
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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110
Medium nts Uploaded: 07 Aug 2026

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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