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11th Standard Chemistry Periodic Classification of Elements English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. What would be the IUPAC name for an element with atomic number 222?

    (a)

    bibibiium

    (b)

    bididium

    (c)

    didibium

    (d)

    bibibium

  2. The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called

    (a)

    p-block elements

    (b)

    d-block elements

    (c)

    s-block elements

    (d)

    f-block elements

  3. The first list of 23 chemical elements was published by _____ in the year 1789.

    (a)

    Berzelius

    (b)

    Dobereiner

    (c)

    Lavoisier

    (d)

    John Dalton

  4. The statement that is not correct for modern classification of element is
    (1) The properties of elements are periodic function of these atomic numbers.
    (2) The ionisation enthalpy of the elements generally increase with increase in atomic number
    (3) For transition elements the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals.
    (4) Fifth period contain 18 elements.

    (a)

    1 and 2

    (b)

    2 and 3

    (c)

    4 only

    (d)

    3 only

  5. Law of octaves was proposed by _____

    (a)

    Lothar Meyer

    (b)

    Johann Dobereiner

    (c)

    Newland

    (d)

    Mendeleev

  6. Match the list I with list II and select the correct answer using the code given below the list.

    List I List II
    A de Chancourtois 1 Addition of synthetic elements.
    B Moseley 2 first periodic law
    C Newland 3 Modem periodic law
    D Glenn seaborg 4 Law of octaves
    (a)
    A B C D
    1 2 3 4
    (b)
    A B C D
    3 2 4 1
    (c)
    A B C D
    2 3 4 1
    (d)
    A B C D
    2 3 1 4
  7. The vertical columns in the periodic table are called as

    (a)

    family

    (b)

    group

    (c)

    period

    (d)

    both (a) and (c)

  8. The number of groups in the periodic table

    (a)

    7

    (b)

    18

    (c)

    5

    (d)

    6

  9. ______ is the lightest metal known.

    (a)

    Na

    (b)

    Li

    (c)

    Mg

    (d)

    Al

  10. On moving diagonally across the periodic table, the second and third period elements show certain similarities. Pick out the pair which shows such a property.

    (a)

    Be & Na

    (b)

    Be & AI

    (c)

    Be & Mg

    (d)

    B & AI

  11. Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

    (a)

    metalliods

    (b)

    transition elements

    (c)

    non-metals

    (d)

    gases

  12. Find the incorrect statement.

    (a)

    Smallest atom of periodic table is He

    (b)

    p-block elements are metals, nonmetals and metalloids

    (c)

    Noble gases have 8 valence electrons except He

    (d)

    Valence electron and valency is same for group I

  13. Characteristic of transition elements is incomplete

    (a)

    d-orbitals

    (b)

    f-orbitals

    (c)

    p-orbitals

    (d)

    s-orbitals

  14. The number of elements in the first period of the modern periodic table is _____

    (a)

    2

    (b)

    8

    (c)

    18

    (d)

    32

  15. In the third period the first ionization potential is of the order.

    (a)

    Na > Al > Mg > Si > P

    (b)

    Na < Al < Mg < Si < P

    (c)

    Mg > Na > Si > P > Al

    (d)

    Na< Al < Mg < Si < P

  16. Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

    (a)

    Al < O < C < Ca < F

    (b)

    Al < Ca < O < C < F

    (c)

    C < F < O < Al < Ca

    (d)

    Ca < Al < C < O < F

  17. Which one of the following is the least electronegative element?

    (a)

    Bromine

    (b)

    Chlorine

    (c)

    Iodine

    (d)

    Hydrogen

  18. 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

  19. IE1 and IE2 of Mg are 179 and 348 kcal mol-1 respectively. The energy required for the reaction Mg⟶ Mg2+ + 2e- is

    (a)

    +169 kcal mol-1

    (b)

    - 169 kcal mol-1

    (c)

    + 527 kcal mol-1

    (d)

    - 527 kcal mol-1

  20. 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

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