NCERT Class X Science Class: Chapter –5. Periodic Classification of Elements – Part-1

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Multiple Choice Questions

Question 1:

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

  1. Oxygen

  2. Calcium

  3. Cobalt

  4. Potassium

Answer: B

Image the Newlands Law of Octaves

Image the Newlands Law of Octaves

Image the Newlands Law of Octaves

Question 2:

According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of

  1. Increasing atomic number

  2. Decreasing atomic number

  3. Increasing atomic masses

  4. Decreasing atomic masses

Answer: C

Image Increase atomic mass in modern periodic table

Image Increase Atomic Mass in Modern Periodic Table

Image Increase atomic mass in modern periodic table

Question 3:

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

  1. Germanium

  2. Chlorine

  3. Oxygen

  4. Silicon

Answer: A

Image the Mendeleev's Predictions

Image the Mendeleev's Predictions

Image the Mendeleev's Predictions

Question 4:

Which of the following statement (s) about the Modern Periodic Table are incorrect

  1. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number

  2. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses

  3. Isotopes are placed in adjoining group (s) in the Periodic Table

  4. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number

  5. (i) only

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

  7. (i), (ii) and (iv)

  8. (iv) only

Answer: B

Modern Periodic Table- ionization energy

Modern Periodic Table- Ionization Energy

Modern Periodic Table- ionization energy

Question 5:

Which of the following statements about the Modern Periodic Table is correct:

  1. It has 18 horizontal rows known as Periods

  2. It has 7 vertical columns known as Periods

  3. It has 18 vertical columns known as Groups

  4. It has 7 horizontal rows known as Groups

Answer: C

Image Periodic Table with group name

Image Periodic Table with Group Name

Image Periodic Table with group name

Question 6:

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?

  1. A, B, C

  2. B, C, D

  3. A, D, E

  4. B, D, E

Answer: B

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