Class 10 Chemistry



Periodic Classification

Solution NCERT Exemplar Problems

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

  • Oxygen
  • Calcium
  • Cobalt
  • Potassium
    Answer: (b) Calcium

  • According to Mendeleev'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
      Answer: (c) Increasing atomic masses
  • In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
    • Germanium
    • Chlorine
    • Oxygen
    • Silicon
      Answer: (a) Germanium
  • Which of the following statement (s) about the Modern Periodic Table are incorrect
    • The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
    • The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
    • Isotopes are placed in adjoining group (s) in the Periodic Table
    • The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
    • (i) only
    • (i), (ii) and (iii)
    • (i), (ii) and (iv)
    • (iv) only
      Answer: (b) (i), (ii) and (iii)

  • Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
    • A, B, C
    • B, C, D
    • A, D, E
    • B, D, E
      Answer: (b) B, C, D
  • The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group?
    • A and B
    • B and D
    • A and C
    • D and E
      Answer: (a) A and B
  • Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
    • Group 8
    • Group 2
    • Group 18
    • Group 10
      Answer: (c) Group 18

  • An element which is an essential constituent of all organic compounds belongs to
    • Group 1
    • Group 14
    • Group 15
    • Group 16
      Answer: (b) Group 14
  • Which of the following statements about the Modern Periodic Table is correct:
    • It has 18 horizontal rows known as Periods
    • It has 7 vertical columns known as Periods
    • It has 18 vertical columns known as Groups
    • It has 7 horizontal rows known as Groups
      Answer: (c) It has 18 vertical columns known as Groups

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Exemplar MCQ 2

Exemplar MCQ 3

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