NCERT Class X Science Class: Chapter – 5. Periodic Classification of Elements – Part-5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 21:

Which of the following elements will form an acidic oxide?

  1. An element with atomic number 7
  2. An element with atomic number 3
  3. An element with atomic number 12
  4. An element with atomic number 19

Answer: A

Question 22:

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?

  1. Metal
  2. Metalloid
  3. Non-metal
  4. Left-hand side element

Answer: B

Image the Metalloid

Question 23:

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

Image the Representation of Atomic Radius (R) of an Atom
  1. (i) and (ii)
  2. (ii) and (iii)
  3. (iii) and (iv)
  4. (i) and (iv)

Answer: B

Question 24:

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

  1. Atomic radius
  2. Metallic character
  3. Valence
  4. Number of shells in an element

Answer: C

Image the Periodic Properties

Question 25:

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

  1. Increases
  2. Decreases
  3. Does not change appreciably
  4. First decreases and then increases

Answer: B

Image the Decreasing Atomic Size