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Chemistry MCQs

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Atomic StructureChemical BondingReactionsOrganic Chemistry
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101
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of hydrocarbon contains at least one carbon to carbon double bond?

  • A Alkane
  • B Alkyne
  • C Alkene
  • D Arene
Permalink
Correct Answer: Option C — Alkene
Explanation: Alkenes are unsaturated hydrocarbons containing at least one carbon to carbon double bond making them more reactive than alkanes and important in polymer production.
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102
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
Permalink
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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103
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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104
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
Permalink
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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105
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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106
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of formula shows all the bonds between atoms in a molecule?

  • A Empirical formula
  • B Structural formula
  • C Molecular formula
  • D Ionic formula
Permalink
Correct Answer: Option B — Structural formula
Explanation: A structural formula shows all the atoms in a molecule and the bonds between them either as a displayed formula showing each bond or as a condensed structural formula.
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107
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which type of organic reaction adds atoms across a carbon to carbon double bond in alkenes?

  • A Substitution
  • B Addition
  • C Elimination
  • D Hydrolysis
Permalink
Correct Answer: Option B — Addition
Explanation: Addition reactions are characteristic of alkenes where atoms or groups add across the carbon-carbon double bond breaking it and forming two new single bonds with the carbon atoms.
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108
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfur dioxide a gas that causes acid rain?

  • A SO3
  • B S2O
  • C SO
  • D SO2
Permalink
Correct Answer: Option D — SO2
Explanation: Sulfur dioxide SO2 is produced by burning fossil fuels containing sulfur and when it reacts with atmospheric moisture it forms sulfurous and sulfuric acid contributing to acid rain.
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109
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for glucose, the primary energy source for cells?

  • A C6H10O5
  • B C12H22O11
  • C C6H12O6
  • D C6H6O6
Permalink
Correct Answer: Option C — C6H12O6
Explanation: Glucose has the chemical formula C6H12O6 and is a monosaccharide sugar that serves as the primary energy source for cellular respiration in living organisms.
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110
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What does Avogadro's number represent?

  • A Number of atoms in 1 gram of hydrogen
  • B Number of particles in one mole of a substance
  • C Number of molecules in 1 litre of gas
  • D Number of protons in a nucleus
Permalink
Correct Answer: Option B — Number of particles in one mole of a substance
Explanation: Avogadro's number is approximately 6.022 x 10 to the power 23 and represents the number of atoms molecules or ions contained in one mole of any substance.
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111
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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112
Hard css fpsc Uploaded: 14 Jul 2026

What is the chemical formula for chloroform a once common anaesthetic?

  • A CH2Cl2
  • B CCl4
  • C CHCl2
  • D CHCl3
Permalink
Correct Answer: Option D — CHCl3
Explanation: Chloroform has the chemical formula CHCl3 and was historically used as an anaesthetic and is now used as a solvent in chemical synthesis and laboratory work.
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113
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which process hardens rubber by adding sulfur making it stronger and more elastic?

  • A Vulcanisation
  • B Saponification
  • C Hydrogenation
  • D Polymerisation
Permalink
Correct Answer: Option A — Vulcanisation
Explanation: Vulcanisation is the process of treating rubber with sulfur at high temperature creating cross-links between polymer chains making the rubber harder more durable and resistant to temperature changes.
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114
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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115
Easy fpsc Uploaded: 07 Aug 2026

What is the chemical formula of ozone?

  • A O4
  • B O
  • C O2
  • D O3
Permalink
Correct Answer: Option D — O3
Explanation: Ozone has the chemical formula O3, consisting of three oxygen atoms bonded together. It forms a protective layer in the stratosphere that absorbs harmful ultraviolet radiation from the sun, shielding life on Earth.
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116
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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117
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
Permalink
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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118
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is formed when an alcohol reacts with a carboxylic acid?

  • A Ester and water
  • B Salt and water
  • C Soap
  • D Alkene and water
Permalink
Correct Answer: Option A — Ester and water
Explanation: When an alcohol reacts with a carboxylic acid an esterification reaction occurs producing an ester and water and this reaction requires an acid catalyst such as concentrated sulfuric acid.
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119
Easy fpsc Uploaded: 07 Aug 2026

Which of the following is a property of metals?

  • A Low melting points
  • B Poor conductors of heat
  • C Brittle
  • D Malleable and ductile
Permalink
Correct Answer: Option D — Malleable and ductile
Explanation: Metals are generally malleable and ductile, meaning they can be hammered into sheets or drawn into wires without breaking. This property arises from the delocalized electron sea structure that allows metal atoms to slide past each other.
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120
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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