History Of Periodic Table

6 Questions | Total Attempts: 45

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History Of Periodic Table

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Questions and Answers
  • 1. 
    Dobereiner's triad was based on 
    • A. 

      Atomic mass

    • B. 

      Atomic number 

    • C. 

      Ions 

    • D. 

      Valency

  • 2. 
    Who proposed the law of octaves?
    • A. 

      Mendeleev

    • B. 

      Newland

    • C. 

      Mosely

    • D. 

      Dobereiner

  • 3. 
    Position of isotope was a problem in 
    • A. 

      Mendeleev's

    • B. 

      Newland's

    • C. 

      Dobereiner's

  • 4. 
    Merit of mendeleev' periodic table
    • A. 

      Based on atomic mass

    • B. 

      Position of isotopes

    • C. 

      Left gaps for discovery of elements

    • D. 

      Position of hydrogen

  • 5. 
    The atomic mass of sodium if lithium - mass 7, sodium and potassium mass 39 are triads is 
    • A. 

      23

    • B. 

      30

    • C. 

      26

    • D. 

      21

  • 6. 
    Demerit of Newland's classification is 
    • A. 

      Only lighter elements could be arranged

    • B. 

      Only heavier elements could be arranged

    • C. 

      Position of isotopes

    • D. 

      Position of hydrogen

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