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11th Stateboard Chemistry Periodic Classification Of Elements Important Questions Feb-15 , 2019

Periodic Classification Of Elements Important Questions

11th Stateboard Chemistry Periodic Classification Of Elements Important Questions

Periodic Classification Of Elements Important Questions

11th Standard

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Chemistry

Answer all the questions

Time : 02:00:00 Hrs
Total Marks : 50
    10 x 1 = 10

  1. The electronic configuration of the elements A and B are 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is ___________

    (a)

    AB

    (b)

    AB2

    (c)

    A2B

    (d)

    none of the above

  2. Period of an element is represented by _____ quantum number

    (a)

    Principal

    (b)

    Azimuthal

    (c)

    Magnetic

    (d)

    Spin

  3. Which of the following statement (s) about the Modern Periodic Table is are incorrect
    i. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
    ii. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
    iii. Isotopes are placed in adjoining group (s) in the Periodic Table.
    iv. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

    (a)

    (i) only

    (b)

    (i), (ii) and (iii)

    (c)

    (i), (ii) and (iv)

    (d)

    (iv) only

  4. The atomic weight of Au is ______

    (a)

    195

    (b)

    197

    (c)

    198

    (d)

    196

  5. The vertical columns in the periodic table are called as ___________

    (a)

    family

    (b)

    group

    (c)

    period

    (d)

    both (a) and (c)

  6. Modern periodic law is ____________

    (a)

    The physical and chemical properties of the elements are periodic functions of their atomic numbers.

    (b)

    The physical and chemical properties of the elements depend upon the energy of the electrons.

    (c)

    The physical and chemical properties of the elements depend upon atomic weight.

    (d)

    None of these

  7. 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.

  8. 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

  9. Which of the following orders of ionic radii is correct?

    (a)

    H- > H+ > H

    (b)

    Na+ > F- > O2-

    (c)

    F > O2- > Na+

    (d)

    None of these

  10. Which of the following pairs of elements exhibit diagonal relationship?

    (a)

    Be and Mg

    (b)

    Li and Mg

    (c)

    Be and B

    (d)

    Be and Al

    11. 5 x 2 = 10

  11. Magnesium loses electrons successively to form Mg+, Mg2+ and Mg3+ ions. Which step will have the highest ionisation energy and why?

  12. Mandeleev predicted that elements with atomic weights 72.68 and 70 in group IV and their properties. Name the elements that were discovered later and have properties predicted by Mandeleev.

  13. Define 'electron affinity'.

  14. The first ionisation energy (lE1) and second ionisation energy (lE2) of elements X, Y and Z are given below.

    Element IE1(kJ mol-1) IE2(kJ mol-1)
    X 2370 5250
    Y 522 7298
    Z 1680 3381

    Which one of the above elements is the most reactive metal, the least reactive metal and a noble gas?

  15. Explain about the period variation of electronegativity along a group.

    16. 5 x 3 = 15

  16. In what period and group will an element with Z = 118 will be present?

  17. Mention any two anomalous properties of second period elements.

  18. Write the name and deduce the atomic number of the following element
    i. The second alkali metal
    ii. The fourth noble gas
    iii. The third halogen
    iv. The first transition element

  19. What are transuranium elements?

  20. Why d-block elements are known as transition element?

    21. 3 x 5 = 15

  21. By using paulings method calculate the ionic radii of K+ and CI- ions in the potassium chloride crystal. Given that dk+-cl-=3.14 Å. 

  22. State the trends in the variation of electronegativity in group and periods.

  23. I.E increases as we move across the period but Ionisation enthalpies (I.E) of second period of elements in the order.
    Li < B < Be < C < O < N < F < Ne
    Explain why?
    (i) Be has higher I.E and B
    (ii) O has lower I.E than N & F

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