Atoms And Molecules Quiz Questions

15 Questions | Total Attempts: 106

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Atom And Molecule Quizzes & Trivia

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Questions and Answers
  • 1. 
    If 92.6g of mercury reacts with 7.4g of oxygen then what will be the mass of mercuric oxide?
    • A. 

      100g

    • B. 

      92.4g

    • C. 

      7.4g

    • D. 

      7g

  • 2. 
    If 8.4g of magnesium carbonate on heating gave 4.4g of carbon dioxide and 4.0g of magnesium oxide. These agreement are in agreement with______________
    • A. 

      Law of constant proportion

    • B. 

      Law of conservation of mass

    • C. 

      Law of multiple proportion

    • D. 

      Gay lussac's law

  • 3. 
    Which of the following is one of the drawback of dalton's atomic theory?
    • A. 

      Matter is made up of atoms

    • B. 

      Atoms are indivisible

    • C. 

      Atom is neither created nor destroyed

    • D. 

      An element consists of only one type of atoms

  • 4. 
    The molecular mass of ozone is
    • A. 

      32 u

    • B. 

      16 u

    • C. 

      54 u

    • D. 

      48 u

  • 5. 
    What is the symbol of sodium and copper?
    • A. 

      N and C respectively

    • B. 

      S and C respectively

    • C. 

      Na and Cu respectively

    • D. 

      Na and Co respectively

  • 6. 
    The number of atoms present in a molecule of a substance is
    • A. 

      Molecularity

    • B. 

      Atomicity

    • C. 

      Valency

    • D. 

      Reactivity

  • 7. 
    What is the valency of cabon in carbon dioxide
    • A. 

      2

    • B. 

      1

    • C. 

      4

    • D. 

      3

  • 8. 
    Atomic weight of nitrogen is 14. It means that
    • A. 

      It is 14 times heavier than hydrogen atom d) None of the above Mass of Nitrogen is 14 gram

    • B. 

      It is 14 times heavier than carbon-12 atom

    • C. 

      It is of is grams

    • D. 

      None of the above

  • 9. 
    Name the scientist who gave the atomic theory of matter
    • A. 

      Albert Einstein

    • B. 

      John Dalton

    • C. 

      James Chadwick

    • D. 

      Neils Bohr

  • 10. 
    Magnesium and oxygen combine in the ratio of 3:2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 grams of magnesium?
    • A. 

      16 g b) 45 g c) 12 g d) 19 g 16g

    • B. 

      45 g

    • C. 

      12 g

    • D. 

      19 g

  • 11. 
    The smallest atom of all is _________.
    • A. 

      C

    • B. 

      H

    • C. 

      Cu

    • D. 

      Na

  • 12. 
    The value of Avogadro number is _______________.
    • A. 

      9.022 x 10^23 ( ^ = THESE SYMBOL INDICATES TO THE POWER )

    • B. 

      6.022 X 10^23

    • C. 

      12.44 X 10^23

    • D. 

      3.011 X 10^23

  • 13. 
    1 mole = ___________ mass of element.
    • A. 

      Kilogram

    • B. 

      Metre

    • C. 

      Gram atomic

    • D. 

      None of this these

  • 14. 
    What is the valency of nitrogen in ammonia (NH3 )
    • A. 

      3

    • B. 

      4

    • C. 

      2

    • D. 

      1

  • 15. 
    What is the formula of lithium nitride
    • A. 

      LiN

    • B. 

      (LI2)3 N

    • C. 

      Li2N

    • D. 

      Li3N

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