10th Standard English Medium Science Subject Atoms and Molecules Book Back 4 Mark Questions with Solution Part - II

10th Standard

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 20
    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 number of moles in
    (i) 27g of Al
    (ii) 1.51 × 1023 molecules of NH4Cl

  3. Give the salient features of “Modern atomic theory”.

  4. How many grams are there in the following?
    i) 2 moles of hydrogen molecule, H2
    ii) 3 moles of chlorine molecule, Cl2
    iii) 5 moles of sulphur molecule, S8
    iv) 4 moles of phosphorous molecule, P4

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

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