Classification Of Elements And Periodicity CBSE Questions & Answers

Classification Of Elements And Periodicity

This is Chemistry Class 11 Classification of Elements and Periodicity CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in
  • A
    decreasing order of their atomic weights
  • B
    increasing order of their atomic numbers
  • C
    decreasing order of their atomic numbers
  • D
    increasing order of their atomic weights
    Correct
2
According to Mendeleev 'Periodic Law' states
  • A
    The properties of the elements are a periodic function of their atomic number.
  • B
    The properties of the elements are a periodic function of the number of neutrons.
  • C
    The properties of the elements are a periodic function of their atomic weights.
    Correct
  • D
    The properties of the elements are a periodic function of the number of electrons.
3
Mendeleev arranged elements in horizontal rows and vertical columns of a table in order of their increasing atomic weights in such a way that the elements with similar properties occupied
  • A
    the same vertical column or group
    Correct
  • B
    the same Horizontal row or series
  • C
    the positions on the top left to bottom right diagonal
  • D
    the positions on the bottom left to top right diagonal
4
Mendeleev relied on the similarities in the empirical formulas and properties of the compounds formed by the elements. He realized that some of the elements did not fit in with his scheme of classification if the order of atomic weight was strictly followed. He therefore
  • A
    amended the periodic law
  • B
    placed the elements with same atomic number together
  • C
    placed the elements with similar properties together
    Correct
  • D
    placed the elements with same atomic weight together
5
Mendeleev proposed that some of the elements were still undiscovered and, therefore, left several gaps in the table. He left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon. These were later discovered and named
  • A
    Mendelivium and Germanium respectively
  • B
    Gallium and Godolinium respectively
  • C
    Barium and Germanium respectively
  • D
    Gallium and Germanium respectively
    Correct
6
Modern Periodic Law can be stated as:
  • A
    The physical and chemical properties of the elements are periodic functions of their neutron numbers.
  • B
    The physical and chemical properties of the elements are independent of their atomic numbers.
  • C
    The physical and chemical properties of the elements are periodic functions of their atomic masses.
  • D
    The physical and chemical properties of the elements are periodic functions of their atomic numbers.
    Correct
7
It is now recognized that the ‘Modern Periodic Law’ is essentially the consequence of the
  • A
    periodic variation in electronic configurations
    Correct
  • B
    periodic variation in chemical bonds
  • C
    periodic variations in the element lattice
  • D
    periodic variation in chemical properties
8
In the modern periodic table
  • A
    The horizontal rows are called series and the vertical columns, groups.
  • B
    The horizontal rows are called groups and the vertical columns, periods
  • C
    The horizontal rows are called periods and the vertical columns, series.
  • D
    The horizontal rows are called periods and the vertical columns, groups.
    Correct
9
According to the recommendation of International Union of Pure and Applied Chemistry (IUPAC), the groups in the modern periodic table are numbered from
  • A
    1 to 18
    Correct
  • B
    1 to 12
  • C
    1 to 10
  • D
    1 to 8
10
Choose one of one of the following in the order of increasing radii:
  • A
    $I{\text{ }} < {\text{ }}{I^ + } < {\text{ }}{I^\_}$
  • B
    ${I^\_} < {\text{ }}{I^ + } < {\text{ }}I$
  • C
    ${I^ + } < {\text{ }}{I^\_} < {\text{ }}I$
  • D
    ${I^ - } > {\text{ }}I{\text{ }} > {\text{ }}{I^ + }$
    Correct
11
For Atomic numbers greater than 100 IUPAC has made recommendation that until a new element ‘s discovery is proved, and its name is officially recognized, a systematic nomenclature be derived directly from the atomic number of the element using the numerical roots for 0 and numbers 1-9. The name 'sept' in this scheme corresponds to the digit
  • A
    8
  • B
    3
  • C
    4
  • D
    7.0
    Correct
12
For Atomic numbers greater than 100 IUPAC has made recommendation that until a new element ‘s discovery is proved, and its name is officially recognized, a systematic nomenclature be derived directly from the atomic number of the element using the numerical roots for 0 and numbers 1-9. Element name Unnilhexium in this scheme corresponds to an atomic number of
  • A
    110
  • B
    106.0
    Correct
  • C
    107
  • D
    105
13
For Atomic numbers greater than 100 IUPAC has made recommendation that until a new element ‘s discovery is proved, and its name is officially recognized, a systematic nomenclature be derived directly from the atomic number of the element using the numerical roots for 0 and numbers 1-9. Element name Ununnillium in this scheme corresponds to an atomic number of
  • A
    108
  • B
    110.0
    Correct
  • C
    109
  • D
    111
14
Electronic configuration of an element
  • A
    The distribution of electrons into orbitals of an atom
    Correct
  • B
    The distribution of electrons into magnetic states of an atom
  • C
    The distribution of electrons into spin state of an atom
  • D
    The distribution of electrons into azimuthal orbitals of an atom only
15
The third period (n = 3) begins at sodium, and the added electron enters a.
  • A
    2p orbital
  • B
    2s orbital
  • C
    3s orbital
    Correct
  • D
    3p orbital