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Chemistry MCQs

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1
Hard css fpsc ppsc Uploaded: 05 Aug 2026

Which element has the highest electronegativity of all elements on the Pauling scale?

  • A Fluorine
  • B Oxygen
  • C Chlorine
  • D Nitrogen
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Correct Answer: Option A — Fluorine
Explanation: Fluorine has the highest electronegativity of all elements at 3.98 on the Pauling scale due to its small atomic size and high effective nuclear charge attracting bonding electrons most strongly.
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2
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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3
Hard ppsc Uploaded: 06 Aug 2026

Which of the following is used as a catalyst in the Haber process?

  • A Platinum
  • B Iron
  • C Nickel
  • D Copper
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Correct Answer: Option B — Iron
Explanation: Iron acts as a catalyst in the Haber process, which combines nitrogen and hydrogen gases to produce ammonia. This industrial process is crucial for manufacturing fertilizers that support global agricultural production.
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4
Hard ppsc Uploaded: 06 Aug 2026

What is the molar mass of water approximately?

  • A 16 g/mol
  • B 20 g/mol
  • C 18 g/mol
  • D 22 g/mol
Permalink
Correct Answer: Option C — 18 g/mol
Explanation: Water has a molar mass of approximately 18 grams per mole, calculated by adding the atomic masses of two hydrogen atoms and one oxygen atom. This value is fundamental in stoichiometric calculations involving water.
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5
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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6
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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7
Hard ppsc Uploaded: 06 Aug 2026

What is the atomic mass unit based on?

  • A Hydrogen-1
  • B Oxygen-16
  • C Helium-4
  • D Carbon-12
Permalink
Correct Answer: Option D — Carbon-12
Explanation: The atomic mass unit is defined as one-twelfth the mass of a Carbon-12 atom. This standard allows scientists to compare the relative masses of different atoms and molecules consistently across the periodic table.
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8
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for the energy required to remove one electron from a gaseous atom?

  • A Electron affinity
  • B Electronegativity
  • C Lattice energy
  • D Ionisation energy
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Correct Answer: Option D — Ionisation energy
Explanation: Ionisation energy is the minimum energy required to remove one electron from a gaseous atom in its ground state with first ionisation energy increasing across a period and decreasing down a group.
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9
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which element has the highest electronegativity on the Pauling scale?

  • A Oxygen
  • B Chlorine
  • C Nitrogen
  • D Fluorine
Permalink
Correct Answer: Option D — Fluorine
Explanation: Fluorine has the highest electronegativity of all elements at 3.98 on the Pauling scale due to its small atomic size and high effective nuclear charge on its outer electrons.
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10
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the chemical formula for potassium permanganate a strong oxidising agent?

  • A KMnO4
  • B K2MnO4
  • C K2SO4
  • D K2Cr2O7
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Correct Answer: Option A — KMnO4
Explanation: Potassium permanganate has the formula KMnO4 and is a strong oxidising agent used in water treatment as a disinfectant and in analytical chemistry as a titrating agent.
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11
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What are the products of the electrolysis of brine sodium chloride solution?

  • A Sodium and water
  • B Hydrogen chlorine and sodium hydroxide
  • C Chlorine and sodium
  • D Sodium chloride and water
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Correct Answer: Option B — Hydrogen chlorine and sodium hydroxide
Explanation: Electrolysis of brine produces hydrogen gas at the cathode chlorine gas at the anode and sodium hydroxide solution remaining in the electrolyte through the chlor-alkali process.
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12
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the chemical formula for bleaching powder used in water purification?

  • A Ca(OH)2
  • B CaCO3
  • C Ca(OCl)Cl
  • D CaCl2
Permalink
Correct Answer: Option C — Ca(OCl)Cl
Explanation: Bleaching powder is calcium hypochlorite chloride Ca(OCl)Cl made by passing chlorine gas over slaked lime and used as a disinfectant and bleaching agent.
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