10 - Science - 10. Chemistry – Atoms And Molecules

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Atom And Molecule Quizzes & Trivia

Questions and Answers
  • 1. 
    From the given examples, form the pair of isotopes.   18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37
    • A. 

      18 Ar 40, 20 Ca 40

    • B. 

      17 Cl 35, 17 Cl 37

  • 2. 
    From the given examples, form the pair of isobars.   18 Ar 40, 17 Cl 35, 20 Ca 40, 17 Cl 37
    • A. 

      17 Cl 35, 17 Cl 37

    • B. 

      18 Ar 40, 20 Ca 40

  • 3. 
    Molecular mass of nitrogen is 28. Its atomic mass is 14. Find the atomicity of nitrogen.
    • A. 

      28

    • B. 

      14

    • C. 

      2

    • D. 

      3

  • 4. 
    Gram molecular mass of oxygen is 32g. Density of oxygen is 1.429g/cc. Find the gram molecular volume of oxygen.
    • A. 

      1.429g/cc

    • B. 

      32g

    • C. 

      1 lit

    • D. 

      22.4 lit

  • 5. 
    Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.
    • A. 

      1

    • B. 

      16

    • C. 

      18

    • D. 

      19

  • 6. 
    One mole of any substance contains 6.023 x 1023 particles. If 3.0115 x 1023  particles are present in CO2. Find the number of moles.
    • A. 

      1

    • B. 

      2

    • C. 

      .05

    • D. 

      0.25