10th Standard CBSE - Science - Periodic Classification of Elements

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Question - 1

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table?

  • A The elements become less metallic in nature.
  • B The number of valence electrons increases.
  • C The atoms lose their electrons more easily.
  • D The oxides become more acidic.

Question - 2

Element X forms a chloride with the formula XCl2 , which is a solid a high melting point. X would most likely be in the same group of the Periodic Table as :

  • A Na
  • B Mg
  • C Al
  • D Si

Question - 3

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

  • A Oxygen
  • B Calcium
  • C Cobalt
  • D Potassium

Question - 4

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

  • A increasing atomic number
  • B decreasing atomic number
  • C increasing atomic masses
  • D decreasing atomic masses

Question - 5

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

  • A Germanium
  • B Chlorine
  • C Oxygen
  • D Silicon

Question - 6

Which of the following statement(s) about the Modern Periodic Table are incorrect
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
(iI) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
(iii) Isotopes are placed in adjoining group(s) in the Periodic Table.
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number

  • A i) only
  • B i), ii) and iii)
  • C i), ii) and iv)
  • D iv) only

Question - 7

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

  • A It has 18 horizontal rows known as Periods
  • B It has 7 vertical columns known as Periods
  • C It has 18 vertical columns known as Groups
  • D It has 7 horizontal rows known as Groups.

Question - 8

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 A,B,C
  • B B,C,D
  • C A,D,E
  • D B,D,E

Question - 9

The elements A,B,C,D and E have atomic number 9,11,17,12 and 13 respectively. Which pair of elements belong to the same group?

  • A A and B
  • B B and D
  • C A and C
  • D D and E

Question - 10

Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?

  • A Group 8
  • B Group 2
  • C Gropu 18
  • D Group 10
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