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Chemistry MCQs

417 Questions Subject Test
Subject Preparation Guide

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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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Which state of matter has a definite volume but no definite shape?

  • A Solid
  • B Liquid
  • C Gas
  • D Plasma
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Which term describes a substance's resistance to flow?

  • A Vapor pressure
  • B Viscosity
  • C Density
  • D Surface tension
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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which reaction type involves the breaking of a large molecule into smaller ones?

  • A Synthesis
  • B Displacement
  • C Decomposition
  • D Neutralisation
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Medium nts Uploaded: 06 Aug 2026

Which compound is commonly known as marsh gas?

  • A Ethane
  • B Propane
  • C Methane
  • D Butane
225
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What is the primary constituent of Portland cement?

  • A Calcium carbonate
  • B Calcium silicate
  • C Calcium oxide
  • D Calcium sulfate
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Which factor does not affect the rate of a chemical reaction?

  • A Catalyst presence
  • B Temperature
  • C Concentration
  • D Color of reactants
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What is a precipitation reaction?

  • A Formation of water only
  • B Absorption of heat
  • C Formation of an insoluble solid from two solutions
  • D Formation of a gas
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Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which process is used to separate crude oil into useful fractions based on different boiling points?

  • A Fractional distillation
  • B Chromatography
  • C Crystallisation
  • D Filtration
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Medium pms Uploaded: 07 Aug 2026

Which gas is responsible for the pungent smell in rotten eggs?

  • A Ammonia
  • B Methane
  • C Sulfur dioxide
  • D Hydrogen sulfide
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Which element is a metalloid?

  • A Silicon
  • B Calcium
  • C Aluminum
  • D Sodium
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Which isotope of carbon is used in radiocarbon dating?

  • A Carbon-12
  • B Carbon-13
  • C Carbon-11
  • D Carbon-14
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Which of the following is a greenhouse gas?

  • A Carbon dioxide
  • B Nitrogen
  • C Argon
  • D Helium
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Which element is used as a moderator in nuclear reactors?

  • A Uranium
  • B Plutonium
  • C Graphite
  • D Cadmium
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Medium ppsc Uploaded: 04 Sep 2026

What is molality?

  • A Grams of solute per liter
  • B Moles of solute per kg of solvent
  • C Moles of solute per liter of solution
  • D Moles of solvent per liter
235
Medium fpsc Uploaded: 04 Sep 2026

Which type of chemical formula shows the actual number of atoms of each element in a molecule?

  • A Structural formula
  • B Empirical formula
  • C Skeletal formula
  • D Molecular formula
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Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which scientific law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules?

  • A Boyle's Law
  • B Gay-Lussac's Law
  • C Avogadro's Law
  • D Charles's Law
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Which of these compounds is an example of an ester?

  • A Ethanol
  • B Ethanoic acid
  • C Ethyl ethanoate
  • D Ethylene
238
Easy ppsc Uploaded: 04 Sep 2026

A reaction in which both oxidation and reduction occur simultaneously is called:

  • A Combustion reaction only
  • B Redox reaction
  • C Neutralization reaction
  • D Precipitation reaction
239
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the atomic number of oxygen?

  • A 6
  • B 10
  • C 8
  • D 16
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What is Avogadro's Law concerned with?

  • A Pressure and volume relationship
  • B Rate of gas diffusion
  • C Volume and temperature relationship
  • D Equal volumes of gases contain equal numbers of moles
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