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Chemistry MCQs

129 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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Easy ppsc Uploaded: 07 Aug 2026

Which of the following is an example of a covalent compound?

  • A Calcium oxide
  • B Magnesium chloride
  • C Sodium chloride
  • D Water
122
Easy css Uploaded: 04 Sep 2026

Enzymes are biological catalysts primarily made of:

  • A Lipids
  • B Nucleic acids
  • C Carbohydrates
  • D Proteins
123
Easy fpsc Uploaded: 07 Aug 2026

What is the molecular formula of methane?

  • A CH2
  • B CH3
  • C CH4
  • D C2H6
124
Easy pms Uploaded: 04 Sep 2026

What is the term for a negatively charged ion?

  • A Isotope
  • B Anion
  • C Cation
  • D Radical
125
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the process by which plants use carbon dioxide and water to make glucose using sunlight?

  • A Respiration
  • B Transpiration
  • C Photosynthesis
  • D Decomposition
126
Easy ppsc Uploaded: 07 Aug 2026

Which reaction type involves the combination of two or more substances to form a single product?

  • A Decomposition reaction
  • B Combination reaction
  • C Displacement reaction
  • D Double displacement reaction
127
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What is an exothermic reaction?

  • A Always requires a catalyst
  • B Has no heat change
  • C Absorbs heat from surroundings
  • D Releases heat to surroundings
128
Easy fpsc Uploaded: 04 Sep 2026

Which gas is primarily responsible for the greenhouse effect and global warming?

  • A Helium
  • B Argon
  • C Nitrogen
  • D Carbon dioxide
129
Easy fpsc Uploaded: 06 Aug 2026

What is the formula for table salt?

  • A NaCl
  • B KCl
  • C CaCl2
  • D MgCl2
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