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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

90 Questions
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81
Chemistry Medium

Which particle determines the chemical properties of an element?

  • ANeutron
  • BElectron
  • CProton
  • DNucleus
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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.
Submitted by: PaperMCQs
82
Chemistry Easy

What is the atomic number of oxygen?

  • A6
  • B10
  • C8
  • D16
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Correct Answer: Option C — 8
Explanation: Oxygen has an atomic number of 8 meaning it has 8 protons in its nucleus and typically 8 electrons in its neutral form with an electronic configuration of 2,6.
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83
Chemistry Medium

Which law states that matter can neither be created nor destroyed in a chemical reaction?

  • ALaw of Definite Proportions
  • BLaw of Multiple Proportions
  • CLaw of Conservation of Mass
  • DLaw of Combining Volumes
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Correct Answer: Option C — Law of Conservation of Mass
Explanation: The Law of Conservation of Mass proposed by Lavoisier states that the total mass of reactants equals the total mass of products in any chemical reaction.
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84
Chemistry Easy

What is the chemical formula for sulfuric acid?

  • AH2SO4
  • BHNO3
  • CHCl
  • DH3PO4
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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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85
Chemistry Medium

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

  • ACovalent bond
  • BIonic bond
  • CMetallic bond
  • DHydrogen 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.
Submitted by: PaperMCQs
86
Chemistry Easy

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

  • A5
  • B9
  • C7
  • D14
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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.
Submitted by: PaperMCQs
87
Chemistry Easy

Which element is the most abundant in the universe?

  • AHydrogen
  • BHelium
  • CCarbon
  • DOxygen
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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.
Submitted by: PaperMCQs
88
Chemistry Easy

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

  • AOxygen
  • BHydrogen
  • CNitrogen
  • DCarbon dioxide
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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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89
Chemistry Easy

What is the atomic number of carbon?

  • A4
  • B6
  • C8
  • D12
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Correct Answer: Option B — 6
Explanation: Carbon has an atomic number of 6 meaning it has 6 protons in its nucleus and 6 electrons in its neutral state making it the basis of all organic chemistry.
Submitted by: PaperMCQs
90
Chemistry Easy

Which scientist is known as the Father of Modern Chemistry?

  • AIsaac Newton
  • BRobert Boyle
  • CJohn Dalton
  • DAntoine 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.
Submitted by: PaperMCQs
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