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Atoms and Molecules

10th Standard Science Atoms and Molecules Model Question Paper

Atoms and Molecules Model Questions

10th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. The gram molecular mass of oxygen molecule is

    (a)

    16 g

    (b)

    18 g

    (c)

    32 g

    (d)

    17 g

  2. 1 mole of any substance contains __________ molecules

    (a)

    6.023 × 1023

    (b)

    6.023 × 10-23

    (c)

    3.0115 × 1023

    (d)

    12.046 × 1023

  3. The mass of an atom is measured in ____________

    (a)

    kg

    (b)

    amu

    (c)

    g

    (d)

    Pm

  4. Atoms of different elements with different atomic numbers, but same mass number are known as _________

    (a)

    isobars

    (b)

    isotopes

    (c)

    isotones

    (d)

    isomers

  5. Pick out the isotopes among the following pairs

    (a)

    6C13, 7N14

    (b)

    18Ar4, 20Ca4

    (c)

    6C12, C614

    (d)

    5B12, 6C13

    6. 5 x 1 = 5

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

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    22400

  7. Atomicity of phosphorous is ___________

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    4

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

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    C-12

  9. The value of Avogadro's number is ______________

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    6.023 x 1023

  10. ___________ is the smallest indivisible entity of matter.

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    Atom

    11. 5 x 1 = 5

  11. 52 g of He

    12. (1)

    S8

  12. 112 g of N2

    13. (2)

    T4

  13. 35.5 g of Cl2

    14. (3)

    4 moles

  14. Tetratomic

    15. (4)

    0.5 moles

  15. Octatomic

    16. (5)

    13 moles
    2 x 5 = 10

  16. Calculation of mass from mole
    Calculate the mass of the following
    i) 0.3 mole of aluminium (Atomic mass of Al = 27)
    ii) 2.24 litre of SO2 gas at S.T.P
    iii) 1.51 × 1023 molecules of water
    iv) 5 × 1023 molecules of glucose

  17. Find the mass of 2.5 mole of oxygen atom.

    18. 5 x 2 = 10

  18. Define: Atomicity

  19. Give any two examples for heterodiatomic molecules.

  20. What is Molar volume of a gas?

  21. Define atomic mass unit?

  22. Measurement of atomic mass of an element is very difficult? Give reason.

    23. 5 x 3 = 15

  23. Calculate the number of water molecule present in one drop of water which weighs 0.18 g.

  24. Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32).

  25. Calculate the % relative abundance of B -10 and B -11, if its average atomic mass is 10.804 amu.

  26. Give the applications of Avogadro's hypothesis.

  27. How will you determine the atomicity of gases using Avogadro's hypothesis?

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