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Chemistry MCQs

34 Questions Subject Test
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21
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the pH of pure water at 25 degrees Celsius?

  • A 5
  • B 9
  • C 7
  • D 14
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Correct Answer: Option C — 7
Explanation: Pure water has a pH of exactly 7 at 25 degrees Celsius making it neutral as it contains equal concentrations of hydrogen and hydroxide ions.
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22
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas turns limewater milky when bubbled through it?

  • A Oxygen
  • B Carbon dioxide
  • C Hydrogen
  • D Sulfur dioxide
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Correct Answer: Option B — Carbon dioxide
Explanation: Carbon dioxide turns limewater milky when bubbled through it as it reacts with calcium hydroxide to produce insoluble calcium carbonate as a white precipitate.
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23
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ammonia?

  • A NO2
  • B N2H4
  • C NH3
  • D NH4
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Correct Answer: Option C — NH3
Explanation: Ammonia has the chemical formula NH3 consisting of one nitrogen atom bonded to three hydrogen atoms and is widely used in fertiliser production and as a cleaning agent.
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24
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for hydrogen peroxide commonly used as an antiseptic?

  • A H2O2
  • B H2O
  • C H3O2
  • D HO2
Permalink
Correct Answer: Option A — H2O2
Explanation: Hydrogen peroxide H2O2 is a pale blue liquid used as an antiseptic bleaching agent and rocket propellant differing from water by having an extra oxygen atom.
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25
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas is produced when an acid reacts with a metal?

  • A Oxygen
  • B Hydrogen
  • C Nitrogen
  • D Carbon dioxide
Permalink
Correct Answer: Option B — Hydrogen
Explanation: When acids react with metals hydrogen gas is produced along with a salt for example zinc reacting with hydrochloric acid produces zinc chloride and hydrogen gas.
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26
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfuric acid?

  • A H2SO4
  • B HNO3
  • C HCl
  • D H3PO4
Permalink
Correct Answer: Option A — H2SO4
Explanation: Sulfuric acid has the chemical formula H2SO4 and is one of the most important industrial chemicals used in fertiliser production batteries and various chemical processes.
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27
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which scientist is known as the Father of Modern Chemistry?

  • A Isaac Newton
  • B Robert Boyle
  • C John Dalton
  • D Antoine Lavoisier
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Correct Answer: Option D — Antoine Lavoisier
Explanation: Antoine Lavoisier is known as the Father of Modern Chemistry for establishing the law of conservation of mass and developing a systematic chemical nomenclature.
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28
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
Permalink
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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29
Easy fpsc Uploaded: 07 Aug 2026

What is the chemical formula of ozone?

  • A O4
  • B O
  • C O2
  • D O3
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Correct Answer: Option D — O3
Explanation: Ozone has the chemical formula O3, consisting of three oxygen atoms bonded together. It forms a protective layer in the stratosphere that absorbs harmful ultraviolet radiation from the sun, shielding life on Earth.
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30
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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31
Easy fpsc Uploaded: 07 Aug 2026

Which of the following is a property of metals?

  • A Low melting points
  • B Poor conductors of heat
  • C Brittle
  • D Malleable and ductile
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Correct Answer: Option D — Malleable and ductile
Explanation: Metals are generally malleable and ductile, meaning they can be hammered into sheets or drawn into wires without breaking. This property arises from the delocalized electron sea structure that allows metal atoms to slide past each other.
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32
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
Permalink
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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33
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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34
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
Permalink
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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