MCQ Questions for Class 10 Science Chapter 5 Periodic Classification of Elements

Practicing with MCQ Questions for Class 10 Science Chapter 5 Periodic Classification of Elements will help you improve your speed and accuracy on the exam. They help to identify the areas where the students need more work. With a little practice, you’ll be able to ace any test that comes your way.

Chapter 5 Class 10 Science CBSE MCQ Questions are a great way to test your understanding of a topic and can be used to prepare for exams. This will help them to focus on the most important topics and to better understand the material.

Chapter 5 Periodic Classification of Elements Class 10 Science MCQ Questions

1. Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al:
(a) Cl> Si > Al > Mg > Na
(b) Na > Mg > Al > Si > Cl
(c) Na > Al > Mg >Cl > Si
(d) Al> Na > Si > Ca > Mg
▶ (b) Na > Mg > Al > Si > Cl

2. An element has an atomic number of 15 with which of the following elements will it show similar chemical properties?
(a) Be(4)
(b) Ne(10)
(c) N(7)
(d) O(8)
▶ (c) N(7)

3. According to Mendeleev’s periodic law, the properties of elements are a periodic function of their
(a) atomic numbers
(b) atomic masses
(c) atomic volumes
(d) atomic sizes
▶ (b) atomic masses

4. Cl, Br and I is a Döberiener’s triad. If the atomic masses of Cl and I are 35.5 and 127 respectively then the atomic mass of Br is
(a) 162.5
(b) 91.5
(c) 81.25
(d) 45.625
▶ (c) 81.25

5. 14 elements after actinium is called
(a) Lanthanides
(b) Actinides
(c) d-block elements
(d) p-block elements
▶ (b) Actinides

6. The group number and period number respectively of an element with atomic number 8 is
(a) 6, 2
(c) 6, 8
(b) 16, 2
(d) 16, 4
▶ (a) 6, 2

7. Element belonging to which of the following atomic numbers 11, 19, 14, 18, 23 belong to the same period?
(a) 11, 14, 23
(b) 11, 18, 20
(c) 11, 14, 18
(d) 14, 19, 23
▶ (c) 11, 14, 18

8. The elements with atomic number 3 to 10 belong to the second period. Identify the most electropositive and the most electronegative element respectively.
(a) F, Li
(b) Li, F
(c) Li, Ne
(d) Ne, Li
▶ (b) Li, F

9. Identify the group which is not a Döbereiner triad
(a) Li, Na, K
(b) Be, Mg, Cr
(c) Ca, Sr, Ba
(d) Cl, Br, I
▶ (b) Be, Mg, Cr

10. Arrange the following atoms in the order of increasing atomic radius : F, Cl, C, O
(a) F, Cl, O, C
(b) C, O, F, Cl
(c) O, C, F, Cl
(d) F, O, C, Cl
▶ (d) F, O, C, Cl

11. The correct order of the increasing radii of the elements Na, Si, Al and P is
(a) Si, Al, P, Na
(c) Al, Si, P, Na
(b) P, Si, Al, Na
(d) Al, P, Si, Na
▶ (c) Al, Si, P, Na

12. According to modern periodic law, the properties of elements are a periodic function of their
(a) atomic masses
(b) atomic volumes
(c) atomic numbers
(d) densities
▶ (c) atomic numbers

13. 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
▶ (a) Germanium

14. Mendeleev predicted the existence of two elements and named them as eka-silicon and eka-aluminium. Identify the element which took their position at later stage.
(a) Si and Ge
(b) Si and Ga
(c) Ge and Ga
(d) Si and Al
▶ (c) Ge and Ga

15. Which of the given elements A, B, C, D, and E with atomic number 3, 11, 15, 18, 19 respectively belong to the same group
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) A, B, E
▶ (b) B, C, D

16. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the 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.
▶ (c) The atoms lose their electrons more easily.

17. Which is not true about noble gases?
(a) They are non-metallic in nature
(b) They exist in atomic form
(c) They are radioactive in nature
(d) Xenon is the most reactive among these
▶ (c) They are radioactive in nature

18. Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses.
(ii) Isotopes of an element have same atomic number.
(iii) Isotopes of an element show same physical properties.
(iv) Isotopes of an element show same chemical properties.
(A) (i), (iii) and (iv)
(B) (ii), (iii) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)
▶ (D) (ii) and (iv)

19. “The properties of the elements are periodic function of their atomic numbers”. The statement was given by
(a) N. Bohr
(c) D. I. Mendeleev
(b) J. W. Dobereiner
(d) H. G. J. Moseley
▶ (d) H. G. J. Moseley

20. Which of the following properties does not match elements of halogen family?
(a) They have seven electrons in their valence shell.
(b) They are diatomic in their molecular form.
(c) They are highly reactive.
(d) They are metallic in nature.
▶ (d) They are metallic in nature.

21. 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.
▶ (c) The atoms lose their electrons more easily

22. It was assumed by Newlands that only
(a) 56 elements existed in nature
(b) 57 elements existed in nature
(c) 59 elements existed in nature
(d) 63 elements existed in nature
▶ (a) 56 elements existed in nature

23. An element M forms an ion M. The electronic configuration of this ion is (2,8). Which statement is true?
(a) Mis in Group VI and Period 2.
(b) Mis Group VII and Period 2.
(c) Mis in Group VII and Period 3.
(d) Mis in Group VI and Period 3.
▶ (b) Mis Group VII and Period 2.

24. Which of the following elements will form an acidic oxide?
(a) An element with atomic number 7
(b) An element with atomic number 3
(c) An element with atomic number 12
(d) An element with atomic number 19
▶ (a) An element with atomic number 7

25. 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.
▶ (c) It has 18 vertical columns known as Groups.

26. Which of the following pairs of atomic numbers represents elements belonging to the same group?
(a) 11 and 20
(b) 12 and 30
(c) 13 and 31
(d) 14 and 33
▶ (c) 13 and 31

27. Which of the following is not the characteristics of isotopes of an element? Isotopes of an element
(a) show same atomic mass
(b) show same atomic number
(c) occupy same position in the Periodic Table
(d) show same chemical properties
▶ (a) show same atomic mass

28. Which statement about the elements in periodic table is correct?
(a) The elements are arranged in order of increasing atomic mass.
(b) The elements in a period have the same number of outer electrons.
(c) The elements in a group have the same number of occupied electron shells.
(d) The non-metallic characteristic of the elements decreases down a group and increases across a period.
▶ (d) The non-metallic characteristic of the elements decreases down a group and increases across a period.

29. Moving down a group of the periodic table,
(a) the number of valence electrons increases
(b) the metallic characteristics of the elements increases
(c) the ability of the elements to form positive ions decreases
(d) the atomic number of the elements decreases.
▶ (b) the metallic characteristics of the elements increases

30. The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is
(a) Henry Moseley
(b) Johann Wolfgang Dobereiner
(c) John Newlands
(d) Dmitri Ivanovich Mendeleev.
▶ (a) Henry Moseley