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Chemistry MCQs

123 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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61
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the process by which plants use carbon dioxide and water to make glucose using sunlight?

  • A Respiration
  • B Transpiration
  • C Photosynthesis
  • D Decomposition
Permalink
Correct Answer: Option C — Photosynthesis
Explanation: Photosynthesis uses sunlight to convert carbon dioxide and water into glucose and oxygen in the chloroplasts of plant cells following the equation 6CO2 plus 6H2O giving C6H12O6 plus 6O2.
Submitted by: PaperMCQs
62
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which chemical process converts vegetable oils into solid fats by adding hydrogen gas?

  • A Saponification
  • B Hydrogenation
  • C Esterification
  • D Fermentation
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Correct Answer: Option B — Hydrogenation
Explanation: Hydrogenation adds hydrogen gas to unsaturated vegetable oils in the presence of a nickel catalyst converting carbon-to-carbon double bonds to single bonds producing solid margarine.
Submitted by: PaperMCQs
63
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which acid is used in car batteries as the electrolyte?

  • A Sulfuric acid
  • B Hydrochloric acid
  • C Nitric acid
  • D Acetic acid
Permalink
Correct Answer: Option A — Sulfuric acid
Explanation: Sulfuric acid H2SO4 is used as the electrolyte in lead-acid car batteries where it facilitates the electrochemical reactions between lead electrodes to store and release electrical energy.
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64
Medium fpsc Uploaded: 07 Aug 2026

Which of the following is a strong base?

  • A Acetic acid
  • B Carbonic acid
  • C Ammonia
  • D Sodium hydroxide
Permalink
Correct Answer: Option D — Sodium hydroxide
Explanation: Sodium hydroxide is classified as a strong base because it completely dissociates in water to release hydroxide ions. It is widely used in soap manufacturing, drain cleaners, and various industrial chemical processes.
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65
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which process separates a mixture of liquids based on their different boiling points?

  • A Distillation
  • B Filtration
  • C Crystallisation
  • D Chromatography
Permalink
Correct Answer: Option A — Distillation
Explanation: Distillation separates mixtures of liquids with different boiling points by heating the mixture and selectively condensing and collecting vapours of the lower boiling point component.
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66
Easy fpsc Uploaded: 06 Aug 2026

What is the formula for table salt?

  • A NaCl
  • B KCl
  • C CaCl2
  • D MgCl2
Permalink
Correct Answer: Option A — NaCl
Explanation: Table salt is chemically known as sodium chloride, with the formula NaCl. It forms through an ionic bond between a sodium cation and a chloride anion, and is essential for various biological and industrial processes.
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67
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which type of isomerism involves compounds with the same molecular formula but different structural arrangements?

  • A Structural isomerism
  • B Optical isomerism
  • C Geometric isomerism
  • D Dynamic isomerism
Permalink
Correct Answer: Option A — Structural isomerism
Explanation: Structural isomers have the same molecular formula but different connectivity of atoms leading to different structural arrangements and distinct physical and chemical properties.
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68
Medium fpsc Uploaded: 06 Aug 2026

Which of the following describes an exothermic reaction?

  • A Absorbs heat from surroundings
  • B Requires constant cooling
  • C No change in temperature
  • D Releases heat to surroundings
Permalink
Correct Answer: Option D — Releases heat to surroundings
Explanation: An exothermic reaction releases heat energy to its surroundings, often resulting in a temperature increase. Common examples include combustion reactions and the setting of concrete, both of which release energy as products form.
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69
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which law states that the amount of substance deposited during electrolysis is directly proportional to the quantity of electricity passed?

  • A Boyle's Law
  • B Gay-Lussac's Law
  • C Avogadro's Law
  • D Faraday's First Law of Electrolysis
Permalink
Correct Answer: Option D — Faraday's First Law of Electrolysis
Explanation: Faraday's First Law of Electrolysis states that the mass of a substance deposited at an electrode during electrolysis is directly proportional to the quantity of charge passed.
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70
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of chemical bond exists between water molecules causing its unusually high boiling point?

  • A Covalent bond
  • B Hydrogen bond
  • C Ionic bond
  • D Van der Waals force
Permalink
Correct Answer: Option B — Hydrogen bond
Explanation: Hydrogen bonds between water molecules are responsible for water's unusually high boiling point surface tension and many other unique properties essential for life.
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71
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

What is the chemical formula for sucrose the common table sugar?

  • A C6H12O6
  • B C12H10O11
  • C C12H22O11
  • D C6H10O5
Permalink
Correct Answer: Option C — C12H22O11
Explanation: Sucrose the common table sugar has the formula C12H22O11 and is a disaccharide formed from glucose and fructose joined by a glycosidic bond formed during a condensation reaction.
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72
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of reaction releases energy to the surroundings causing the temperature to rise?

  • A Endothermic
  • B Reversible
  • C Equilibrium
  • D Exothermic
Permalink
Correct Answer: Option D — Exothermic
Explanation: Exothermic reactions release energy to the surroundings causing a temperature rise as bonds formed in products are stronger than bonds broken in reactants such as combustion.
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73
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of organic compounds contain only carbon and hydrogen atoms?

  • A Hydrocarbons
  • B Alcohols
  • C Carbohydrates
  • D Carboxylic acids
Permalink
Correct Answer: Option A — Hydrocarbons
Explanation: Hydrocarbons are organic compounds containing only carbon and hydrogen atoms and include alkanes alkenes alkynes and aromatic compounds such as benzene.
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74
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of organic reaction involves the addition of bromine water across a carbon to carbon double bond?

  • A Addition
  • B Substitution
  • C Elimination
  • D Hydrolysis
Permalink
Correct Answer: Option A — Addition
Explanation: Addition reactions involve adding molecules across the carbon to carbon double bond of an alkene such as the decolourisation of bromine water used as a test for unsaturation.
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75
Easy fpsc Uploaded: 07 Aug 2026

Which of the following elements belongs to Group 17 of the periodic table?

  • A Sulfur
  • B Phosphorus
  • C Oxygen
  • D Chlorine
Permalink
Correct Answer: Option D — Chlorine
Explanation: Chlorine belongs to Group 17, known as the halogens, characterized by having seven valence electrons. These elements are highly reactive nonmetals that readily gain one electron to form stable negative ions.
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76
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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77
Medium fpsc Uploaded: 06 Aug 2026

Which metal is liquid at room temperature?

  • A Sodium
  • B Lithium
  • C Potassium
  • D Mercury
Permalink
Correct Answer: Option D — Mercury
Explanation: Mercury is the only metal that remains in liquid form at standard room temperature due to its unique atomic structure and weak metallic bonding. It is used in thermometers, though its toxicity limits its modern applications.
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78
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which polymer is used to make plastic water bottles and is identified by recycling code 1?

  • A PET polyethylene terephthalate
  • B PVC
  • C Polystyrene
  • D Polypropylene
Permalink
Correct Answer: Option A — PET polyethylene terephthalate
Explanation: PET or polyethylene terephthalate is the plastic used to make water bottles and food packaging and is identified by the recycling code 1 on containers.
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79
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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80
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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