CBSE  /  Class 11  /  Chemistry  /  Classification of Elements and Periodicity in Properties

  • 1. 
    The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:

  • Both are found together in nature
  • Both have nearly the same size
  • Both have similar electronic configuration
  • The ratio of their charge and size (i. e. charge density) is nearly the same

  • 2. 
    The element with atomic number 35 belongs to

  • d – Block
  • f – Block
  • p – Block
  • s – Block

  • 3. 
    The correct order of first ionization potential among following elements, Be, B, C, N and O is

  • B < Be < C < O < N
  • B < Be < C < N < O
  • Be < B < C < N < O
  • Be < B < C < O < N

  • 4. 
    Representative elements are those which belong to

  • p and d – Block
  • s and d – Block
  • s and p – Block
  • s and f – Block

  • 5. 
    Which of the following properties generally decreases along a period?

  • Ionization Energy
  • Metallic Character
  • Electron Affinity
  • Valency.

  • 6. 
    On the Paulings electronegativity scale the element next to F is

  • N
  • Cl
  • O
  • Ne.

  • 7. 
    The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:

  • 16, 5 and 2
  • 15, 5 and 3
  • 16, 6 and 3
  • 15, 6 and 2

  • 8. 
    Which of the following oxides is amphoteric in character?

  • SnO
  • CO
  • SiO
  • CaO

  • 9. 
    In the modern periodic table, the period indicates the value of:

  • Atomic Number
  • Atomic Mass
  • Principal Quantum Number
  • Azimuthal Quantum Number

  • 10. 
    In the long form of the periodic table, the valence shell electronic configuration of 5s²5p

  • Group 16 and period 6
  • Group 17 and period 6
  • Group 16 and period 5
  • Group 17 and period 5
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