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Chemistry MCQs

123 Questions Subject Test
Subject Preparation Guide

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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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Medium fpsc Uploaded: 07 Aug 2026

What is the by-product of the reaction between an acid and a metal carbonate?

  • A Hydrogen gas
  • B Oxygen gas
  • C Water only
  • D Carbon dioxide
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Correct Answer: Option D — Carbon dioxide
Explanation: When an acid reacts with a metal carbonate, carbon dioxide gas is released along with salt and water. This reaction is commonly observed as effervescence and is used to test for the presence of carbonates.
Submitted by: PaperMCQs
22
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the IUPAC name for the simplest hydrocarbon with formula CH4?

  • A Ethane
  • B Butane
  • C Propane
  • D Methane
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Correct Answer: Option D — Methane
Explanation: Methane CH4 is the simplest hydrocarbon and the first member of the alkane series where carbon atoms form single bonds and the molecule is saturated.
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23
Hard css fpsc Uploaded: 14 Jul 2026

Which element in Group 1 of the periodic table reacts most vigorously with water?

  • A Lithium
  • B Sodium
  • C Caesium
  • D Potassium
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Correct Answer: Option C — Caesium
Explanation: Caesium the heaviest stable Group 1 alkali metal reacts most vigorously with water due to its large atomic radius and low ionisation energy resulting in an explosive reaction.
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24
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical name of NaOH?

  • A Sodium chloride
  • B Sodium carbonate
  • C Sodium bicarbonate
  • D Sodium hydroxide
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Correct Answer: Option D — Sodium hydroxide
Explanation: NaOH is sodium hydroxide also known as caustic soda a strong base used in soap making paper production and as a drain cleaner due to its highly alkaline properties.
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25
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which synthetic polymer was the first to be produced commercially and is used to make electrical fittings?

  • A Nylon
  • B PVC
  • C Bakelite
  • D Polythene
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Correct Answer: Option C — Bakelite
Explanation: Bakelite was the first commercially produced synthetic polymer made from phenol and formaldehyde in 1907 and is used in electrical fittings phone casings and kitchenware.
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26
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of bond involves the complete transfer of electrons from one atom to another?

  • A Covalent bond
  • B Ionic bond
  • C Metallic bond
  • D Hydrogen bond
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Correct Answer: Option B — Ionic bond
Explanation: An ionic bond involves the complete transfer of one or more electrons from a metal atom to a non-metal atom creating oppositely charged ions that attract each other electrostatically.
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27
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ozone, the molecule that forms the protective layer in the stratosphere?

  • A O
  • B O2
  • C O3
  • D O4
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Correct Answer: Option C — O3
Explanation: Ozone has the chemical formula O3 consisting of three oxygen atoms and forms the stratospheric ozone layer that absorbs harmful UV radiation protecting life on Earth.
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28
Easy fpsc Uploaded: 06 Aug 2026

What is the common name for sodium bicarbonate?

  • A Caustic soda
  • B Washing soda
  • C Baking soda
  • D Bleaching powder
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Correct Answer: Option C — Baking soda
Explanation: Sodium bicarbonate is commonly known as baking soda, used widely in cooking as a leavening agent. It reacts with acids to release carbon dioxide gas, which causes dough to rise during baking.
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29
Easy fpsc ppsc nts Uploaded: 05 Aug 2026

What is the IUPAC name for CH3-CH2-OH the simplest alcohol found in beverages?

  • A Methanol
  • B Propanol
  • C Butanol
  • D Ethanol
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Correct Answer: Option D — Ethanol
Explanation: Ethanol also written as C2H5OH is the simplest alcohol produced by fermentation of sugars and is found in alcoholic beverages used as a solvent and as a biofuel.
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30
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which test is used to detect the presence of starch using iodine solution?

  • A Benedict's test
  • B Biuret test
  • C Iodine test
  • D Flame test
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Correct Answer: Option C — Iodine test
Explanation: The iodine test detects starch by turning iodine solution from yellow-brown to blue-black in the presence of starch due to the triiodide ion fitting within the starch helix.
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31
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which element is a liquid at room temperature and is used in thermometers?

  • A Bromine
  • B Gallium
  • C Mercury
  • D Caesium
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Correct Answer: Option C — Mercury
Explanation: Mercury is a metal that remains liquid at room temperature with a melting point of minus 38.8 degrees Celsius and has been traditionally used in thermometers and barometers.
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32
Hard css fpsc Uploaded: 14 Jul 2026

Which law states that gases combine in simple whole number ratios by volume at the same temperature and pressure?

  • A Gay-Lussac's Law
  • B Boyle's Law
  • C Charles's Law
  • D Avogadro's Law
Permalink
Correct Answer: Option A — Gay-Lussac's Law
Explanation: Gay-Lussac's Law of Combining Volumes states that gases react in simple whole number ratios by volume at constant temperature and pressure providing evidence for atomic theory.
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33
Medium fpsc Uploaded: 07 Aug 2026

Which element is used in making transistors and computer chips?

  • A Gold
  • B Germanium
  • C Silicon
  • D Silver
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Correct Answer: Option C — Silicon
Explanation: Silicon is the primary material used in manufacturing transistors and computer chips due to its semiconductor properties. Its abundance and ability to be doped with other elements make it ideal for electronic applications.
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34
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of reaction in organic chemistry involves replacing a hydrogen atom with another atom or group?

  • A Elimination
  • B Substitution
  • C Addition
  • D Hydrolysis
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Correct Answer: Option B — Substitution
Explanation: Substitution reactions replace one atom or group in a molecule with another as seen when chlorine substitutes hydrogen in methane under UV light producing chloromethane.
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35
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which acid is present in the human stomach to aid digestion?

  • A Sulfuric acid
  • B Nitric acid
  • C Acetic acid
  • D Hydrochloric acid
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Correct Answer: Option D — Hydrochloric acid
Explanation: Hydrochloric acid HCl is secreted by the stomach lining to aid protein digestion by activating pepsin and also kills most bacteria ingested with food.
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36
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

What is the chemical formula for laughing gas used as a mild anaesthetic in dentistry?

  • A NO
  • B N2O
  • C NO2
  • D N2O4
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Correct Answer: Option B — N2O
Explanation: Nitrous oxide N2O commonly known as laughing gas is used as a mild anaesthetic and analgesic in dentistry and medicine and produces euphoric effects when inhaled.
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37
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of chemical formula shows the simplest whole number ratio of atoms in a compound?

  • A Molecular formula
  • B Structural formula
  • C Displayed formula
  • D Empirical formula
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Correct Answer: Option D — Empirical formula
Explanation: An empirical formula shows the simplest whole number ratio of each type of atom in a compound for example glucose C6H12O6 has the empirical formula CH2O.
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38
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which particle determines the chemical properties of an element?

  • A Neutron
  • B Electron
  • C Proton
  • D Nucleus
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Correct Answer: Option B — Electron
Explanation: Electrons especially the valence electrons in the outermost shell determine the chemical properties of an element including its reactivity bonding behaviour and the compounds it forms.
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39
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which process involves passing an electric current through a solution to cause a chemical reaction?

  • A Electrolysis
  • B Distillation
  • C Chromatography
  • D Filtration
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Correct Answer: Option A — Electrolysis
Explanation: Electrolysis passes an electric current through an electrolyte solution or molten ionic compound causing chemical reactions at the electrodes and is used to extract metals and plate surfaces.
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40
Easy fpsc Uploaded: 06 Aug 2026

Which particle is found in the nucleus of an atom along with the neutron?

  • A Electron
  • B Photon
  • C Proton
  • D Ion
Permalink
Correct Answer: Option C — Proton
Explanation: Protons reside in the nucleus of an atom alongside neutrons, while electrons orbit around the nucleus. The number of protons determines the atomic number and identity of an element on the periodic table.
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