NCERT Class X Science Class: Chapter – 5. Periodic Classification of Elements – Part-1 (For CBSE, ICSE, IAS, NET, NRA 2023)
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Multiple Choice Questions
Question 1:
Up to which element, the Law of Octaves was found to be applicable
- Oxygen
- Calcium
- Cobalt
- Potassium
Answer: B
Question 2:
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
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
- Germanium
- Chlorine
- Oxygen
- Silicon
Answer: A
Question 4:
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
Question 5:
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
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?
- A, B, C
- B, C, D
- A, D, E
- B, D, E
Answer: B