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Chemistry MCQs

16 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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1
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Isotopes of an element differ in the number of:

  • A Both protons and electrons
  • B Electrons
  • C Neutrons
  • D Protons
2
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Which glassware is used to deliver a precise, variable volume of liquid during titration?

  • A Beaker
  • B Conical flask
  • C Burette
  • D Test tube
3
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Which element is the lightest gas known?

  • A Helium
  • B Hydrogen
  • C Nitrogen
  • D Oxygen
4
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Which compound is commonly known as baking soda?

  • A Sodium hydroxide
  • B Sodium carbonate
  • C Sodium bicarbonate
  • D Sodium chloride
5
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What is the term for direct conversion of a solid to gas?

  • A Sublimation
  • B Condensation
  • C Evaporation
  • D Deposition
6
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Which gas turns limewater milky?

  • A Hydrogen
  • B Nitrogen
  • C Carbon dioxide
  • D Oxygen
7
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What is the molar mass of water (H2O)?

  • A 20 g/mol
  • B 36 g/mol
  • C 16 g/mol
  • D 18 g/mol
8
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What is the chemical symbol for Sodium?

  • A So
  • B Na
  • C Sd
  • D Su
9
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Which term describes the amount of a substance dissolved in a given amount of solvent?

  • A Solubility
  • B Density
  • C Molarity only
  • D Concentration
10
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What is the SI unit of electric current used in Faraday's laws?

  • A Volt
  • B Coulomb
  • C Ohm
  • D Ampere
11
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What distinguishes a saturated hydrocarbon from an unsaturated one?

  • A Presence of aromatic rings
  • B Presence of double bonds
  • C Presence of triple bonds
  • D Presence of only single bonds
12
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Which of the following is a greenhouse gas?

  • A Carbon dioxide
  • B Nitrogen
  • C Argon
  • D Helium
13
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Which of these elements is an alkaline earth metal?

  • A Calcium
  • B Rubidium
  • C Potassium
  • D Sodium
14
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What is the general term for a substance that speeds up a reaction without being consumed?

  • A Catalyst
  • B Reactant
  • C Solvent
  • D Inhibitor
15
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What is the term for a negatively charged ion?

  • A Isotope
  • B Anion
  • C Cation
  • D Radical
16
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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
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