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Atoms and Molecules

10th Science - Atoms and Molecules Four and Seven Marks Questions

Atoms and Molecules Four and Seven Marks Questions

10th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 55
    5 x 4 = 20

  1. N2 + 3 H2 → 2 NH3
    (The atomic mass of nitrogen is 14, and that of hydrogen is 1)
    1 mole of nitrogen (_______g) +
    3 moles of hydrogen ( _________ g) →
    2 moles of ammonia ( _________ g)

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

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

  4. Give the applications of Avogadro's hypothesis.

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

    6. 5 x 7 = 35

  6. Calculate the gram molecular mass of carbon dioxide (CO2)

  7. Calculate the number of moles in 81g of aluminum.

  8. Calculate the number of moles in 2g of NaOH.

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

  10. Calculate the number of molecules in 11g of CO2

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