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Chemistry MCQs

129 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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21
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for hydrogen peroxide commonly used as an antiseptic?

  • A H2O2
  • B H2O
  • C H3O2
  • D HO2
22
Easy nts Uploaded: 06 Aug 2026

Which subatomic particle has no electric charge?

  • A Neutron
  • B Electron
  • C Proton
  • D Ion
23
Easy nts Uploaded: 07 Aug 2026

What is the chemical formula for baking soda?

  • A Na2CO3
  • B NaHCO3
  • C NaOH
  • D NaCl
24
Easy nts Uploaded: 04 Sep 2026

Which acid is commonly found in vinegar?

  • A Acetic acid
  • B Formic acid
  • C Lactic acid
  • D Citric acid
25
Easy ppsc nts Uploaded: 14 Jul 2026

Which gas has the chemical formula CO2?

  • A Carbon dioxide
  • B Carbon monoxide
  • C Sulfur dioxide
  • D Nitrogen dioxide
26
Easy pms Uploaded: 04 Sep 2026

Which gas turns limewater milky?

  • A Hydrogen
  • B Nitrogen
  • C Carbon dioxide
  • D Oxygen
27
Easy pms Uploaded: 04 Sep 2026

What is the molar mass of water (H2O)?

  • A 20 g/mol
  • B 36 g/mol
  • C 16 g/mol
  • D 18 g/mol
28
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

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

  • A Oxygen
  • B Hydrogen
  • C Nitrogen
  • D Carbon dioxide
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Easy css Uploaded: 04 Sep 2026

What type of bond forms between metals and non-metals?

  • A Hydrogen bond
  • B Metallic bond
  • C Ionic bond
  • D Covalent bond
30
Easy pms Uploaded: 06 Aug 2026

What is the chemical symbol for Sodium?

  • A So
  • B Na
  • C Sd
  • D Su
31
Easy ppsc Uploaded: 04 Sep 2026

Boyle's Law relates which two variables at constant temperature?

  • A Pressure and volume
  • B Volume and temperature
  • C Moles and volume
  • D Pressure and temperature
32
Easy nts Uploaded: 07 Aug 2026

What is the boiling point of water at standard atmospheric pressure?

  • A 90°C
  • B 95°C
  • C 100°C
  • D 110°C
33
Easy ppsc Uploaded: 04 Sep 2026

Which process describes a reaction that absorbs heat from its surroundings?

  • A Adiabatic
  • B Endothermic
  • C Isothermic
  • D Exothermic
34
Easy fpsc Uploaded: 04 Sep 2026

What is a combination (synthesis) reaction?

  • A Two or more substances combine to form one product
  • B One substance breaks into many
  • C An element replaces another in a compound
  • D Two compounds exchange parts
35
Easy pms Uploaded: 04 Sep 2026

Which term describes the amount of a substance dissolved in a given amount of solvent?

  • A Solubility
  • B Density
  • C Molarity only
  • D Concentration
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Easy css Uploaded: 04 Sep 2026

What is the term for a positively charged ion?

  • A Cation
  • B Isotope
  • C Anion
  • D Isomer
37
Easy nts Uploaded: 07 Aug 2026

Which of the following is an example of a physical property?

  • A Flammability
  • B Reactivity with acid
  • C Boiling point
  • D Toxicity
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Easy pms Uploaded: 04 Sep 2026

What is the SI unit of electric current used in Faraday's laws?

  • A Volt
  • B Coulomb
  • C Ohm
  • D Ampere
39
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfuric acid?

  • A H2SO4
  • B HNO3
  • C HCl
  • D H3PO4
40
Easy ppsc Uploaded: 04 Sep 2026

What is the freezing point of pure water at standard atmospheric pressure?

  • A 4°C
  • B 100°C
  • C -10°C
  • D 0°C
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