Quiz  /  Chemistry Class 12 MCQ Questions With Answers

  • 1. 
    Based on the absorption spectrum, what is the likely name of the compound in the image?

  • butanoic acid
  • Pentanol
  • diethylamine
  • aniline

  • 2. 
    Why are ions charged particles?

  • The number of electrons does not equal the number of protons.
  • The number of protons does not equal the number of neutrons.
  • The number of neutrons does not equal the number of electrons.
  • The electric charges of the electrons and protons cancel each other out.

  • 3. 
    Why does an atom undergo beta decay?

  • It has too many electrons.
  • It has an atomic number greater than 83
  • It has more neutrons than protons
  • It has more protons than neutrons

  • 4. 
    Beryllium will ____ valence electrons when forming an ionic bond.

  • lose 4
  • gain 4
  • lose 2
  • gain 2

  • 5. 
    The group made up of alcohols and acids

  • esters
  • carbocilic acids
  • ethers
  • alkynes

  • 6. 
    If an element gains 1 electron, what charge will it have?

  • +1
  • -1
  • +7
  • -7

  • 7. 
    Which compound is made up of carbons and hydrogen

  • hydrocarbons
  • aldehytes
  • condensed structure
  • alcohols

  • 8. 
    How are ionic and covalent bonds alike?

  • They both form organic molecules.
  • They both fill outer electron shells.
  • They both transfer electrons from one atom to another.
  • They both transfer protons from one atom to another.

  • 9. 
    Protons + __________ = atomic mass

  • electrons
  • neutrons
  • neither

  • 10. 
    Organic polymer can be divided into

  • synthetic organic polymer
  • natural organic polymer
  • all of the above

  • 11. 
    The half life of Thorium-234 is 24 days. What fraction of the element remains after 96 days

  • 1/2
  • 1/4
  • 1/8
  • 1/16

  • 12. 
    Macromolecule that is made up of repeated structure called monomers

  • protein
  • amino acids
  • polymer

  • 13. 
    The smallest unit of matter that retains the properties of that matter is

  • a molecule
  • a compound
  • a mixture
  • an atom

  • 14. 
    The time taken for half of an amount of radioactive atoms to decay.

  • Nuclear fusion
  • Full-life
  • Dead time
  • Half-life

  • 15. 
    How many valence electrons does magnesium have?

  • 1
  • 2
  • 12
  • 24

  • 16. 
    Which of these shows SI unit prefixes arranged in order from smallest to largest?

  • centi, milli, kilo
  • milli, centi, kilo
  • kilo, milli, centi
  • kilo, centi, milli

  • 17. 
    If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

  • 16
  • 32
  • 48
  • 64

  • 18. 
    The dimensions of rectangular solid are measured to be 2.0 cm, 3.0 cm, and 4.0 cm. The volume should be recorded as

  • 24 cm3.
  • 12 cm3.
  • 9 cm3.
  • 6 cm3.

  • 19. 
    Which bond does carbon mostly form

  • hydrogen bond
  • dipole-dipole
  • covalent bond

  • 20. 
    The type of reaction that occur in alkenes

  • elimination
  • substitution
  • addition

  • 21. 
    Negatively charged particles found outside of the nucleus are called

  • electron
  • protons
  • neutrons
  • nucleons

  • 22. 
    In a neutral atom, the number of protons always equals

  • the number of neutrons.
  • the number of electrons.
  • the mass number.
  • the average atomic mass.

  • 23. 
    Molecule with the same molecular structure but different structural formula

  • fats
  • lipids
  • fossil fuels
  • isomers

  • 24. 
    The atomic number of an element is equal to the number of

  • protons and electrons
  • protons
  • electrons
  • electrons and neutrons

  • 25. 
    Has the lowest penetrating power. Can only penetrate 0.05 mm into the body and can be stopped by a piece of paper or clothing.

  • Alpha
  • Beta
  • Gamma

  • 26. 
    Theories are considered successful only if they

  • can be used to make accurate predictions.
  • can be stated in simple terms.
  • can be written in the form of an equation.
  • have been accepted by all scientists.

  • 27. 
    Which of these statements is true of the scientific method?

  • The steps may vary somewhat to suit the experiment.
  • Working scientists rarely use it.
  • Scientists must follow its steps exactly.
  • Scientists rarely publish results of experiments.

  • 28. 
    Which nuclear process is shown in the picture?

  • fission
  • fusion
  • alpha decay
  • beta decay
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