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Chemistry MCQs

29 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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1
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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
4
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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
5
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Which type of hybridization is present in water (H2O)?

  • A sp2
  • B sp3
  • C sp
  • D sp3d
6
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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
7
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What is the empirical formula of benzene?

  • A C2H2
  • B C3H3
  • C C6H6
  • D CH
8
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Which process is used to purify metals using electricity?

  • A Roasting
  • B Calcination
  • C Electrorefining
  • D Smelting
9
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What is the term for the amount of energy required to remove an electron from an atom?

  • A Electron affinity
  • B Ionization energy
  • C Electronegativity
  • D Bond energy
10
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What is the term for two or more different atomic nuclei with the same mass number but different atomic numbers?

  • A Isotones
  • B Isomers
  • C Isotopes
  • D Isobars
11
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What is the term for the energy required to remove one electron from a gaseous atom?

  • A Electron affinity
  • B Electronegativity
  • C Lattice energy
  • D Ionisation energy
12
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Which element has the highest electronegativity on the Pauling scale?

  • A Oxygen
  • B Chlorine
  • C Nitrogen
  • D Fluorine
13
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Which of the following best describes Avogadro's number?

  • A 6.022 x 10^20
  • B 6.022 x 10^23
  • C 6.022 x 10^26
  • D 6.022 x 10^29
14
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What is the chemical formula for potassium permanganate a strong oxidising agent?

  • A KMnO4
  • B K2MnO4
  • C K2SO4
  • D K2Cr2O7
15
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Which scientist proposed the modern periodic law?

  • A Antoine Lavoisier
  • B John Dalton
  • C Dmitri Mendeleev
  • D Henry Moseley
16
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Which element has the highest melting point among all elements?

  • A Iron
  • B Tungsten
  • C Platinum
  • D Osmium
17
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What is the chemical formula for chloroform a once common anaesthetic?

  • A CH2Cl2
  • B CCl4
  • C CHCl2
  • D CHCl3
18
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What is the equivalence point in a titration?

  • A Point where indicator changes color permanently
  • B Point where moles of acid equal moles of base
  • C Point of maximum temperature
  • D Starting point of titration
19
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What are the products of the electrolysis of brine sodium chloride solution?

  • A Sodium and water
  • B Hydrogen chlorine and sodium hydroxide
  • C Chlorine and sodium
  • D Sodium chloride and water
20
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What is the chemical formula for bleaching powder used in water purification?

  • A Ca(OH)2
  • B CaCO3
  • C Ca(OCl)Cl
  • D CaCl2
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