Periodicity in Properties

1

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

  1. MgO < K2O < Al2O3 < Na2O
  2. K2O < Na2O < Al2O3 < MgO
  3. Na2O < K2O < MgO < Al2O3
  4. Al2O3 < MgO < Na2O < K2O
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2

According to the periodic law of elements, the variation in properties of elements is related to their

  1. atomic masses
  2. atomic numbers
  3. nuclear masses
  4. nuclear neutron­-proton number ratios
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3

The set representing the correct order of ionic radius is

  1. Li+ > Na+ > Mg2+ > Be2+
  2. Na+ > Li+ > Mg2+ > Be2+
  3. Li+ > Be2+ > Na+ > Mg2+
  4. Mg2+ > Be2+ > Li+ > Na+
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4

The ionic radii (in Å) of N3–, O2– and F are respectively

  1. 1.36, 1.71 and 1.40
  2. 1.71, 1.40 and 1.36
  3. 1.71, 1.36 and 1.40
  4. 1.36, 1.40 and 1.71
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5

Which one of the following ions has the highest value of ionic radius?

  1. Li+
  2. F
  3. O2–
  4. B3+
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6

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

  1. B < P < S < F
  2. F < S < P < B
  3. P < S < B < F
  4. B < S < P < F
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