10th Standard English Medium Science Subject Atoms and Molecules Book Back 7 Mark Questions with Solution Part - I

10th Standard

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 35
  1. 1. Calcium carbonate is decomposed on heating in the following reaction
    CaCO3 → CaO + CO2
    i. How many moles of Calcium carbonate are involved in this reaction?
    ii. Calculate the gram molecular mass of calcium carbonate involved in this reaction.
    iii. How many moles of CO2 are there in this equation?

  2. Calculation based on number of moles from mass and volume
    i) Calculate the number of moles in 46 g of sodium?
    ii) 5.6 litre of oxygen at S.T.P
    iii) Calculate the number of moles of a sample that contains 12.046 × 1023 atoms of iron?

  3. Calculation based on number of atoms/molecules
    i) Calculate the number of molecules in 11.2 litre of CO2 at S.T.P
    ii) Calculate the number of atoms present in 1 gram of gold (Atomic mass of Au = 198)
    iii) Calculate the number of molecules in 54 gm of H2O?
    iv) Calculate the number of atoms of oxygen and carbon in 5 moles of CO2.

  4. Calculation based on molar volume
    Calculate the volume occupied by:
    i) 2.5 mole of CO2 at S.T.P
    ii) 12.046 × 1023 of ammonia gas molecules
    iii) 14 g nitrogen gas

  5. Calculate the percentage of sulphur in H2SO4.

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