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Some Basic Concepts of Chemistry Test - 4

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Some Basic Concepts of Chemistry Test - 4
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  • Question 1
    1 / -0

    Law of conservation of mass was given by:

    Solution

    Antoine Lavoiser gave the law of conservation of mass.

     

  • Question 2
    1 / -0

    If the true value for a result is 3.00 m and a student records two readings as 3.01 m and 2.99 m, then we can conclude that:

    Solution

    Precision indicates how closely repeated measurements match each other.

    Accuracy indicates how closely a measurement matches the correct or expected value.

     

  • Question 3
    1 / -0

    According to the Avogadro's law, equal volumes of gases at the same temperature and pressure should contain:

    Solution

    According to the Avogadro's law, equal volumes of gases at the same temperature and pressure should contain equal number of molecules.

     

  • Question 4
    1 / -0

    If 0.5 mole of BaCl2 is mixed with 0.2 mole of Na3PO4, then the maximum number of moles of Ba3(PO4)2 that can be formed will be:

    Solution

    3BaCl2  +  2Na3PO4  → Ba3(PO4)2 + 6NaCl

    From the molar ratio, we get,

    BaCl2  :  2Na3PO4  :  Ba3(PO4)2  :  6NaCl

    3    :        2       :        1         :     6

    Also, limiting reactant is Na3PO4

    Therefore, 0.2 mol Na3PO4 will give Ba3(PO4)2

    = 0.5 Χ 0.2 = 0.1 mol.

     

  • Question 5
    1 / -0

    Amount of carbon dioxide produced when one mole of carbon is burnt in air is:

    Solution

    C(s) +O2 (g) → CO2(g)

    In this reaction 12g of carbon i.e 1 mole of C burns to produce 44g of carbon dioxide.

     

  • Question 6
    1 / -0

    One atomic mass unit (amu) is closest to the mass of:

    Solution

    One atomic mass unit is approximately 1.672 x 10-27 kg which is closest to the mass of the proton.

     

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