NCERT Class X Science Class: Chapter –5. Periodic Classification of Elements – Part-4

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Question 14:

Which of the following elements would lose an electron easily?

Answer: C

Image the reactivity series of metals

Image the Reactivity Series of Metals

Image the reactivity series of metals

Question 15:

Which of the following elements does not lose an electron easily?

Answer: B

Question 16:

Which of the following are the characteristics of isotopes of an element?

  1. Isotopes of an element have same atomic masses

  2. Isotopes of an element have same atomic number

  3. Isotopes of an element show same physical properties

  4. Isotopes of an element show same chemical properties

  5. (i), (iii) and (iv)

  6. (ii), (iii) and (iv)

  7. (ii) and (iii)

  8. (ii) and (iv)

Answer: D

Question 17:

Arrange the following elements in the order of their decreasing metallic character

Answer: B

Image the decreasing metallic character

Image the Decreasing Metallic Character

Image the decreasing metallic character

Question 18:

Arrange the following elements in the order of their increasing nonmetallic character

Answer: C

Image the increasing nonmetallic character

Image the Increasing Nonmetallic Character

Image the increasing nonmetallic character

Question 19:

What type of oxide would Eka– aluminium form?

Answer: C

Question 20:

Three elements B, Si and Ge are

  1. Metals

  2. Non-metals

  3. Metalloids

  4. Metal, non-metal and metalloid respectively

Answer: C

Image the metals, non metals and semi metals

Image the Metals, Non Metals and Semi Metals

Image the metals, non metals and semi metals

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