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Chemistry MCQs

125 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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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
Medium ppsc Uploaded: 06 Aug 2026

Which element is essential for photosynthesis and found in chlorophyll?

  • A Iron
  • B Magnesium
  • C Zinc
  • D Calcium
Permalink
Correct Answer: Option B — Magnesium
Explanation: Magnesium is a central component of the chlorophyll molecule, which plants use to capture light energy during photosynthesis. Without adequate magnesium, plants cannot efficiently convert sunlight into chemical energy.
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105
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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106
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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107
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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108
Easy ppsc nts Uploaded: 14 Jul 2026

Which noble gas is used in glowing advertising signs giving a reddish-orange colour?

  • A Argon
  • B Helium
  • C Neon
  • D Krypton
Permalink
Correct Answer: Option C — Neon
Explanation: Neon gas is used in neon signs and emits a characteristic reddish-orange glow when electricity passes through it due to the excitation of its electrons.
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109
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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110
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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111
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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112
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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113
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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114
Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for silver?

  • A Si
  • B Ag
  • C Sr
  • D Sn
Permalink
Correct Answer: Option B — Ag
Explanation: The chemical symbol for silver is Ag derived from the Latin word Argentum and silver is a precious metal with the highest electrical and thermal conductivity of all metals.
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115
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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116
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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117
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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118
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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119
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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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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