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Chemistry MCQs

106 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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Which type of isomerism involves compounds with the same molecular formula but different structural arrangements?

  • A Structural isomerism
  • B Optical isomerism
  • C Geometric isomerism
  • D Dynamic isomerism
2
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Which law states that the amount of substance deposited during electrolysis is directly proportional to the quantity of electricity passed?

  • A Boyle's Law
  • B Gay-Lussac's Law
  • C Avogadro's Law
  • D Faraday's First Law of Electrolysis
3
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Which quantum number describes the shape of an orbital?

  • A Azimuthal quantum number
  • B Magnetic quantum number
  • C Spin quantum number
  • D Principal quantum number
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What is the trend in ionization energy down a group?

  • A Remains constant
  • B Fluctuates randomly
  • C Increases
  • D Decreases
5
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Which type of chemical bond exists between water molecules causing its unusually high boiling point?

  • A Covalent bond
  • B Hydrogen bond
  • C Ionic bond
  • D Van der Waals force
6
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Which type of mixture has particles that scatter light, known as the Tyndall effect?

  • A Colloid
  • B True solution
  • C Pure compound
  • D Suspension only
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Which type of chemical reaction involves two compounds exchanging ions to form new compounds?

  • A Decomposition reaction
  • B Single displacement reaction
  • C Combination reaction
  • D Double displacement reaction
8
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Which type of organic reaction involves the addition of bromine water across a carbon to carbon double bond?

  • A Addition
  • B Substitution
  • C Elimination
  • D Hydrolysis
9
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Which element has the highest electronegativity?

  • A Oxygen
  • B Chlorine
  • C Fluorine
  • D Nitrogen
10
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Which type of hybridization is present in water (H2O)?

  • A sp2
  • B sp3
  • C sp
  • D sp3d
11
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Which process adds water to a compound to break chemical bonds in organic reactions?

  • A Dehydration
  • B Oxidation
  • C Reduction
  • D Hydrolysis
12
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What is the term for the energy required to remove an electron from a gaseous atom?

  • A Electronegativity
  • B Ionization energy
  • C Lattice energy
  • D Electron affinity
13
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Which of the following describes Le Chatelier's Principle?

  • A Reactions always favor products
  • B Systems at equilibrium resist changes to conditions
  • C Catalysts change equilibrium position
  • D Reactions cannot reach equilibrium
14
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Which term describes a reaction that proceeds to completion in one direction?

  • A Reversible reaction
  • B Irreversible reaction
  • C Chain reaction
  • D Equilibrium reaction
15
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What is the formula for calculating moles from mass and molar mass?

  • A Moles equals mass times molar mass
  • B Moles equals molar mass divided by mass
  • C Moles equals mass divided by molar mass
  • D Moles equals mass times volume
16
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What is the concentration of a solution measured in moles per litre called?

  • A Normality
  • B Molality
  • C Formality
  • D Molarity
17
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What is the empirical formula of benzene?

  • A C2H2
  • B C3H3
  • C C6H6
  • D CH
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Which process is used to purify metals using electricity?

  • A Roasting
  • B Calcination
  • C Electrorefining
  • D Smelting
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What is the SI unit of amount of substance?

  • A Mole
  • B Litre
  • C Gram
  • D Kilogram
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Which organic functional group is present in alcohols?

  • A Carbonyl group
  • B Hydroxyl group
  • C Carboxyl group
  • D Amino group
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