Class 10 Chemistry

Periodic Classification

NCERT Exemplar Problems

What type of oxide would Eka– aluminium form?

  • EO3
  • E3O2
  • E2O3
  • EO
    Answer: (c) E2O3

Three elements B, Si and Ge are

  • Metals
  • Non-metals
  • Metalloids
  • Metal, non-metal and metalloid respectively
    Answer: (c) Metalloids

Which of the following elements will form an acidic oxide?

  • An element with atomic number 7
  • An element with atomic number 3
  • An element with atomic number 12
  • An element with atomic number 19
    Answer: (a) An element with atomic number 7

Which one of the following depicts the correct representation of atomic radius(r) of an atom?

electronic configuration
  • (i) and (ii)
  • (ii) and (iii)
  • (iii) and (iv)
  • (i) and (iv)
    Answer: (b) (ii) and (iii)

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

  • Atomic radius
  • Metallic character
  • Valence
  • Number of shells in an element
    Answer: (c) Valence

On moving from left to right in a period in the periodic table, the size of the atom.

  • Increases
  • Decreases
  • does not change appreciably
  • first decreases and then increases
    Answer: (b) Decreases

Which of the following set of elements is written in order of their increasing metallic character?

  • Be Mg Ca
  • Na Li K
  • Mg Al Si
  • C O N
    Answer: (a) Be Mg Ca

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

  • Metal
  • Metalloid
  • Non-metal
  • Left-hand side element
    Answer: (b) Metalloid

Exemplar MCQ 1

Exemplar MCQ 2