CBSE  /  Class 10  /  Science  /  Periodic Classification of Elements

  • 1. 
    Upto which element, the Law of Octaves was found to be applicable.

  • Oxygen
  • Calcium
  • Cobalt
  • Potassium

  • 2. 
    According to Medeleev’s Periodic Law, the elements were arranged in the periodic table in the order of

  • increasing atomic number
  • decreasing atomic number
  • increasing atomic masses
  • decreasing atomic masses

  • 3. 
    Consider the following elements:

  • Ca and S
  • Ca and O
  • Ar and S
  • O and S

  • 4. 
    The electronic configuration of the atom of an element X is 2, 4, 8. In the modern periodic table, the element X is placed in:

  • 2nd group
  • 4th group
  • 14th group
  • 8th group

  • 5. 
    Which of the following element would lose an electron easily?

  • Mg
  • Na
  • K
  • Ca

  • 6. 
    The element A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:

  • A and B
  • B and D
  • A and C
  • D and E

  • 7. 
    Which one of the following does not increase while moving down the group of the periodic table?

  • Atomic radius
  • Metallic character
  • Valence electrons
  • Shells in the atoms

  • 8. 
    The Newlands Law of Octaves for the classification of elements was found to be applicable only up to the element

  • Potassium
  • Calcium
  • Cobalt
  • Thorium

  • 9. 
    An element X forms an oxide X^g. In which group of Modem periodic table is this element placed?

  • Group 2
  • Group 3
  • Group 5
  • Group 13

  • 10. 
    The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element have the largest atomic radius is:

  • Mg
  • Na
  • K
  • Ca
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