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Chemistry MCQs

39 Questions Subject Test
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21
Easy ppsc Uploaded: 07 Aug 2026

What type of reaction occurs between an acid and a base?

  • A Combustion reaction
  • B Decomposition reaction
  • C Redox reaction
  • D Neutralization reaction
Permalink
Correct Answer: Option D — Neutralization reaction
Explanation: A neutralization reaction occurs when an acid reacts with a base to produce salt and water. This reaction typically results in a solution with a pH closer to neutral, depending on the strength of reactants.
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22
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of reaction involves an acid reacting with a base to form salt and water?

  • A Decomposition
  • B Redox
  • C Neutralisation
  • D Precipitation
Permalink
Correct Answer: Option C — Neutralisation
Explanation: Neutralisation is the reaction between an acid and a base producing salt and water for example hydrochloric acid reacting with sodium hydroxide to form sodium chloride and water.
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23
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
Permalink
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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24
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
Permalink
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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25
Easy ppsc Uploaded: 07 Aug 2026

Which term describes elements in the same column of the periodic table?

  • A Series
  • B Blocks
  • C Periods
  • D Groups
Permalink
Correct Answer: Option D — Groups
Explanation: Elements arranged in the same vertical column of the periodic table are called groups. Elements within a group share similar chemical properties because they have the same number of valence electrons in their outer shell.
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26
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ammonia?

  • A NO2
  • B N2H4
  • C NH3
  • D NH4
Permalink
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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27
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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28
Easy ppsc nts Uploaded: 14 Jul 2026

Which gas has the chemical formula CO2?

  • A Carbon dioxide
  • B Carbon monoxide
  • C Sulfur dioxide
  • D Nitrogen dioxide
Permalink
Correct Answer: Option A — Carbon dioxide
Explanation: Carbon dioxide with the formula CO2 consists of one carbon atom double bonded to two oxygen atoms and is a major greenhouse gas produced by combustion and respiration.
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29
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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30
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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31
Easy ppsc nts Uploaded: 14 Jul 2026

Which noble gas is used in glowing advertising signs giving a reddish-orange colour?

  • A Argon
  • B Helium
  • C Neon
  • D Krypton
Permalink
Correct Answer: Option C — Neon
Explanation: Neon gas is used in neon signs and emits a characteristic reddish-orange glow when electricity passes through it due to the excitation of its electrons.
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32
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
Permalink
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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33
Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for silver?

  • A Si
  • B Ag
  • C Sr
  • D Sn
Permalink
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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34
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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35
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
Permalink
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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36
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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37
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
Permalink
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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38
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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39
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
Permalink
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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