Atoms and Molecules One Mark Questions

10th Standard EM

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Science

Time : 00:30:00 Hrs
Total Marks : 10
    5 x 1 = 5
  1. Which of the following represents 1 amu?

    (a)

    Mass of a C – 12 atom

    (b)

    Mass of a hydrogen atom

    (c)

    1/12th of the mass of a C – 12 atom

    (d)

    Mass of O – 16 atom

  2. In the nucleus of 20Ca40, there are 

    (a)

    20 protons and 40 neutrons

    (b)

    20 protons and 20 neutrons

    (c)

    20 protons and 40 electrons

    (d)

    40 protons and 20 electrons

  3. The mass of an atom is measured in ____________

    (a)

    kg

    (b)

    amu

    (c)

    g

    (d)

    Pm

  4. Pick out the isotopes among the following pairs

    (a)

    6C13, 7N14

    (b)

    18Ar4, 20Ca4

    (c)

    6C12, C614

    (d)

    5B12, 6C13

  5. Which among the following is a homo atomic molecule?

    (a)

    N2

    (b)

    NH3

    (c)

    HCl

    (d)

    N2O

  6. 5 x 1 = 5
  7. The number of atoms present in a molecule is called its ____________

    ()

    atomicity

  8. One mole of any gas occupies ________ ml at S.T.P

    ()

    22400

  9. Atomicity of phosphorous is ___________

    ()

    4

  10. The mass of the molecule of an element or compound is measured in ______________ scale.

    ()

    C-12

  11. The value of Avogadro's number is ______________

    ()

    6.023 x 1023

  12. 5 x 1 = 5
  13. 8 g of O2

  14. (1)

    13 moles

  15. 4 g of H2

  16. (2)

    He

  17. 52 g of He

  18. (3)

    H2

  19. Monoatomic

  20. (4)

    2 moles

  21. Diatomic

  22. (5)

    0.25 moles

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