Periodic Classification of Elements MCQs with Answer

Periodic Classification Of Elements
Class:10|Chapter:5

Multiple Choice Questions

1. Newlands relation is called
(a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law

2. Upto which element, the Law of Octaves was found applicable?
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium

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?
(a) Chlorine
(b) Silicon
(c) Oxygen
(d) Germanium

4. At the time of Mendeleev, the number of elements known was
(a) 63
(b) 65
(c) 62
(d) 64

5. The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element:
(a) Scandium
(b) Germanium
(c) Gallium
(d) Aluminium

6. An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?
(a) 4th group
(b) 6th group
(c) 3rd group
(d) 2nd group

7. The arrangement of elements in the Modem Periodic Table is based on their
(a) increasing atomic mass in the period
(b) increasing atomic number in the horizontal rows
(c) increasing atomic number in the vertical columns
(d) increasing atomic mass in the group

8. Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
(a) Group 8
(b) Group 2
(c) Group 18
(d) Group 10

9. Element ‘X’ forms a chloride with the formula XCl₂, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
(a) Si
(b) Mg
(c) Al
(d) Na

10. Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is
(a) 7
(b) 14
(c) 24
(d) 16

11. Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br

12. What is the atomic number of element of period 3 and group 17 of the Periodic Table?
(a) 10
(b) 4
(c) 17
(d) 21

13. Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?
(a) The oxides become more acidic
(b) The elements become less metallic
(c) There is an increase in the number of valence electrons
(d) The atoms lose their electrons more easily

14. The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
(a) A and B
(b) A and C
(c) B and C
(d) None

15. An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound.
(a) XY₂
(b) XY
(c) X₂Y
(d) (XY)₂

16. A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
(a) MO
(b) M₂O
(C) M₂O₃
(d) MO₂

17. Name the neutral atom in the Periodic Table which has the same number of electrons as K⁺ and Cl^-.
(a) Helium
(b) Argon
(c) Neon
(d) Krypton

18. An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.
(a) XCl₃
(b) XCl
(c) XCl₂
(d) XCl₅

19. An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
(a) Group 1
(b) Group 4
(c) Group 2
(d) Group 3

20. An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
(a) Valency = 6
(b) Valency = 2
(c) Valency = 1
(d) Valency = 3

21. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
(a) The chemical reactivity of metals increases.
(b) The metallic character of elements increases.
(c) The size of the atom increases.
(d) The valence electrons increase.

22. The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
(a) N(7)
(b) P(15)
(c) Na(11)
(d) F (9)

23. 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)

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

25. The increasing order of the atomic radii of elements Na, Rb, K, Mg is
(a) Na < K < Mg < Rb
(b) K < Na < Mg < Rb
(c) Na < Mg < K < Rb
(d) Mg < Na < K < Rb

26. An element belongs to period 2 and group 2 the number of valence electrons in the atoms of this element is
(a) 2
(b) 4
(c) 3
(d) 1

27. 14 elements after actinium is called
(a) Lanthanides
(b) Actinides
(c) d-block elements
(d) p-block elements

28. In the third period of the Periodic Table the element having smallest size is
(a) Na
(b) Ar
(c) Cl
(d) Si

29. Electronic configuration of Al⁺³ is
(a) 2, 8, 3
(b) 2, 8, 8
(c) 2, 8
(d) 2, 8, 8, 3

30. Which of the following sets does not belong to a group?
(a) Li, Na, K
(b) B, C, N
(c) B, Al, Ga
(d) O, S, Se

31. An element with atomic number will form a basic oxide
(a) 7
(b) 17
(c) 14
(d) 11

32. Arrange the following elements into the increasing order of their metallic character along a period.
(a) S < Si < P < Al
(b) S < P < Si < Al
(c) Si < P < S < Al
(d) Si < S < P < Al

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

34. 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

35. 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

36. 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

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

38. In the Modern Periodic Table calcium (Z = 20) is surrounded by the elements with atomic numbers 12, 19, 21, and 38 which of the following will have physical and chemical properties resembling calcium.
(a) 12, 20, 38
(b) 12, 19, 20, 38
(c) 19, 20, 38
(d) 12, 19, 20

39. Which of the following has maximum non-metallic character?
(a) F
(b) Br
(c) Cl
(d) I

40. 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

41. Vertical columns are called as
(a) groups
(b) periods
(c) rows
(d) none

42. How many groups are there in the periodic table?
(a) 18
(b) 8
(c) 28
(d) 17

43. Which group was added in Mendleev’s periodic table?
(a) I group
(b) VIII group
(c) zero group
(d) V group

44. What is the special name given to the 17th group?
(a) chalcogens
(b) halogens
(c) alkali metals
(d) inert gases

45. Chalcogens are ?
(a) ore forming
(b) salt forming
(c) hydroxide forming
(d) None

46. Atomic mass is equal to the sum of
(a) P+N
(b) P+E
(c) Number of Protons
(d) Number of neutrons

47. Name the most electronegative element of Periodic table ?
(a) Chlorine
(b) Bromine
(c) Fluorine
(d) Iodine

48. Electron affinity is
(a) always negative
(b) always positive
(c) can be negative or positive
(d) zero

49. Ionisation energy is measured in
(a) KJ/g
(b) J/mole
(c) KJ/mol
(d) none

50. Out of Mg and Al which has higher ionisation energy?
(a) Mg
(b) Al
(c) Both have same
(d) None

51. Write valency of Iron ?
(a) 2
(b) 3
(c) 0
(d) 2,3

52. Out of F and Cl, which has higher electron affinity ?
(a) Cl
(b) F
(c) Both have same
(d) none

53. Upto which element, the law of octaves was found to be applicable
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium

54. According to Mendeleev’s Periodic law, the elements were arranged in Periodic table according to
(a) Increasing atomic number
(b) decreasing atomic number
(c) Increasing atomic masses
(d) decreasing atomic masses

55. In Mendeleev’s Periodic table, gaps were left for many elements. Pick any one out of them.
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon

56. What relation do Ar and Ca have?
(a) isotopes
(b) isoelectronic
(c) isobars
(d) isotones

57. Isotopes possess
(a) same number of Protons
(b) same number of neutrons
(c) same mass number
(d) none

58. On which factor does ionisation energy depend?
(a) Size of an atom
(b) nuclear charge
(c) electronic configuration
(d) all

59. Pick out the odd one
(a) Argon
(b) neon
(c) Barium
(d) helium

60. Which is biggest in size
(a) Lithium
(b) sodium
(c) Magnesium
(d) potassium

61. Which out of them is not a halogen?
(a) Fluorine
(b) Chlorine
(c) Iodine
(d) Germanium

62. The standard element chosen for relative atomic mass is __.
(a) Carbon-12
(b) Hydrogen-1
(c) chlorine -35
(d) Iodine -121

63. Electronegativity depends upon ?
(a) size of an atom
(b) nuclear charge on atom
(c) electrons in an atom
(d) all

64. The order of ionisation of alkali group follows which order?
(a) Li > Na > K > Rb > Cs
(b) Li < Na > K < Rb > Cs
(c) Li < Na < K < Rb < Cs
(d) Li > Na < K> Rb < Cs

65. Most electronegative element in group 2 is
(a) Be
(b) Mg
(c) Al
(d) Ca

Answer:

1-b	2-b	3-d	4-a	5-c
6-d	7-b	8-c	9-b	10-b
11-c	12-c	13-d	14-b	15-a
16-b	17-b	18-c	19-a	20-b
21-d	22-d	23-c	24-a	25-c
26-a	27-b	28-b	29-c	30-b
31-d	32-b	33-b	34-b	35-c
36-c	37-b	38-a	39-a	40-a
41-a	42-a	43-c	44-b	45-a
46-a	47-c	48-c	49-c	50-b
51-d	52-a	53-b	54-c	55-a
56-c	57-a	58-d	59-c	60-d
61-d	62-a	63-d	64-d	65-a