Periodic Classification of Elements - Important Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    10 x 1 = 10
  1. In the third period the first ionization potential is of the order

    (a)

    Na > Al > Mg > Si > P

    (b)

    Na< AI < Mg < Si < P

    (c)

    Mg > Na > Si > P > Al

    (d)

    Na < AI < Mg < Si < P

  2. Identify the wrong statement.

    (a)

    Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius

    (b)

    Amongst isoelectric species greater the negative charge  on the anion, larger is the ionic radius

    (c)

    Atomic radius of the elements increases as one moves down the first group of the periodic table

    (d)

    Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table

  3. The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8,7 and 12 respectively

    (a)

    Y > Z > X > A

    (b)

    Z > A >Y > X

    (c)

    X > Y > Z > A

    (d)

    X > Y > A > Z

  4. The electronic configuration of the atom having maximum difference in first and second ionisation energies is

    (a)

    1s2, 2s2, 2p6 3s1

    (b)

    1s2, 2s2,2p6, 3s2

    (c)

    1s2, 2s2,2p6, 3s2, 3s2, 3p6, 4s1

    (d)

    Is2, 2s2,2p6, 3s2, 3p1

  5. The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol-1 respectively. The ionisation potential of Al will be closer to

    (a)

    760 kJ mol-1

    (b)

    575 kJ mol-1

    (c)

    801 kJ mol-1

    (d)

    419 kJ mol-1

  6. Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

    (a)

    Decreases in a period and increases along the group

    (b)

    Increases in a period and decreases in a group

    (c)

    Increases both in the period and the group

    (d)

    Decreases both in the period and in the group

  7. How does electron affinity change when we move from left to right in a period in the periodic table?

    (a)

    Generally increases

    (b)

    Generally decreases

    (c)

    Remains unchanged

    (d)

    First increases and then decreases

  8. A trend common to both for group I and VIII elements in the periodic table as atomic number increases its

    (a)

    atomic radius increases 

    (b)

    oxidising power increases 

    (c)

    reactivity with water increases 

    (d)

    maximum valency increases 

  9. Ionic  radii are 

    (a)

    inversely proportional to effective nuclear charge 

    (b)

    inversely proportional to square of the effective nuclear charge

    (c)

    directly proportional to effective nuclear charge 

    (d)

    directly proportional to square of the effective nuclear charge

  10. The first ionisation enthalpies of Na, Mg, Al, Si are in the order 

    (a)

    NaAl

    (b)

    Na>Mg>Al>Si 

    (c)

    Na

    (d)

    Na>Mg>Al

  11. Part B

    6 x 2 = 12
  12. Briefly outline anomalies of Mandeleev's periodic table

  13. Explain how will you find the atomic number of an element from the frequency of X-rays emitted by an element.

  14. The element 119 has not been discovered. What would be the IUPAC name and symbol for this element? On the basis of periodic table, predict the electronic configuration of this element

  15. State the Newland's law of octaves.

  16. Electron affinity of oxygen is less negative than sulphur. Justify this statement.

  17. Explain about periodic variation of electro negativity across a period.

  18. Part C

    6 x 3 = 18
  19. The elements Z = 117 and 120 have not yet been discovered. In which family/group would you place these elements and also give the electronic configuration in each case.

  20. Arrange the following elements in the increasing order of metallic character: Si, Be, Mg, Na, P.

  21. Why electron affinity of fluorine is less than that of chlorine?

  22. Which among the halogens would you expect to have the least electronegativity and why?

  23. Arrange the following elements in the increasing order of non-metallic character. B, C, Si, N, F

  24. Explain the size of Cl- >Na+.

  25. Part D

    2 x 5 = 10
  26. Give the structural features of modern periodic law.

  27. Give the characteristics of p-block elements.

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