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Mole Concept Test - 3

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Mole Concept Test - 3
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  • Question 1
    1 / -0

    The ratio by mass of magnesium and sulphur in magnesium sulphide is

    Solution

    Atomic mass of Mg = 24 g
    Atomic mass of S = 32 g
    Ratio of Mg and S in MgS = 24 : 32 = 3 : 4

     

  • Question 2
    1 / -0

    The atomic mass of zinc is 65.37 u. Which of the following is the correct weight of 1 atom of zinc?

    Solution

    1 mole of atoms = Gram atomic mass
    Therefore, 65.37 g of zinc = 1 mole of zinc = 6.022 x 1023 atoms of Zn.

    6.022 x 1023 atoms of Zn = 65.37 g
    1 atom of Zn = 65.37/(6.022 x 1023) g = 1.08 x 10-22 g.

     

  • Question 3
    1 / -0

    What is the correct number of hydrogen atoms in 0.25 mole of water?

    Solution

    1 mole of H2O contains 2 moles of H atoms.
    = 2 X 6.023 x 1023 hydrogen atoms

    So, 0.25 mole of H2O contains 2 x 6.023 x 1023 x 0.25 H atoms.
    = 3.01 x 1023 H atoms.

     

     

  • Question 4
    1 / -0

    Which of the following statements is/are correct?

    (a) The word "mole" was introduced in 1896 by Wilhelm Ostwald.
    (b) The mass of 1 mole of a substance is equal to its relative atomic or molecular mass in grams.
    (c) The quantity of a substance can be characterised by the valency of its molecules.

    Solution

    Both the statements (a) and (b) are correct.

    As, (a) The word "mole" was introduced around 1896 by Wilhelm Ostwald who derived the term from the Latin word moles meaning a 'heap' or 'pile`.

    (b) Avogadro`s number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro`s number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022 x 1023 mol-1 and is expressed as the symbol NA.

     

  • Question 5
    1 / -0

    Which of the following statements is/are correct?

    (a) Naturally occurring oxygen is a mixture of atoms of slightly different masses called isotopes.
    (b) Formula mass is used instead of molecular mass for a substance whose constituent particles are ions.
    (c) Basic radicals carry negative charge.

    Solution

    This is the correct answer as both these statements are correct. Isotopes are same elements having different atomic mass but same atomic number.

    For example naturally occurring oxygen is composed of three stable isotopes, 16O, 17O, and 18O and Formulas Mass is a term used for the mass of a unit cell of an ionic compound that is essentially bound to all the other ions around it.

     

  • Question 6
    1 / -0

    Fluoride ion is a monovalent anion because it is a negative ion having a valency of one minus. Which of the following is also a monovalent anion?

    Solution

    This is the correct option. Iodide ion is a monovalent anion.

     

  • Question 7
    1 / -0

    Which of the following statements is/are false?

    (a) Mole is a link between the mass of atoms and the number of atoms.
    (b) The number 6.023 × 1023, which represents a mole, is known as Avogadro's number.
    (c) An atom represents the amount of a substance equal to its gram atomic mass.

    Solution

    Gram atomic mass (GAM) is the mass of one mole of atoms of the substance and not the mass of one atom.

    Both the atomic mass and the gram atomic mass are equal in magnitude. However, the unit for atomic mass is 'u' and that for GAM is 'g'.

     

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