Periodic Classification of Elements & Periodicity MCQS

 CHAPTER # 1

Periodic Classification of Elements & Periodicity

1. Which of the following pairs are chemically

dissimilar?

(A) Na and K (B) Ba and Sr

(C) Zr and Hf (D) Ca and Zn.

2. The total number of inner transition elements

is

(A) 10 (B) 14

(C) 28 (C) 30

3. The alkali metal which is liquid at 15oC is

(A) K (B) Cs

(C) Na (D) None

4. Which of the following ion will form most water

soluble hydroxide?

(A) K+ (B) Ni2+

(B) Zn2+ (C) Al3+

5. Which of the following has greatest tendency

to lose electron?

(A) F (B) Fr

(B) S (C) Be.

6. The oxide of which of the following elements

will be acidic in character

(A) Mg (B) Rb

(C) Li (C) CI

7. Which of the following is isoelectronic with

carbon atom?

(A) Na+ (B) Al3+

(C) O2

- (D) N+

8. Which of the following ions are paramagnetic

in character?

(A) Zn2+ (B) Cu+

(C) Ni2+ (D) Ag+

9. Ca2+ ion is isoelectronic with

(A) Mg2+ (B) Na+

(C) Ar (D) Kr

10. Gradual addition of electronic shells in the

noble gases causes a decrease in their

(A) Ionization energy (B) atomic radius

(C) Boiling point (D) density.

11. Which of the following has highest first

ionization potential?

(A) Carbon (B) Oxygen

(C) Nitrogen (C) Boron.

12. Which of the following has the smallest size?

(A) Na+ (B) Mg2+

(C) Al3+ (D) CI

13. Which of the following element has the

maximum electron affinity?

(A) F (B) S

(C) I (D) CI.

14. Which of the following is isoelectronic as well

as has the same structure as that of N2O ?

(A) N3H (B) H2O

(B) NO2 (C) CO2

15. The atomic radius increases as we move

down a group because

(A) Effective nuclear charge increases

(B) Atomic mass increases

(C) Additive electrons are accommodated in

new electron level

(D) Atomic number increase.

16. Which one of the following is an incorrect

statement?

(A) The ionization potential of nitrogen is

greater than that of chlorine

(B) The electron affinity of fluorine is greater

than that of chlorine

(C) The ionization potential of beryllium is

greater than that of boron

(D) The electronegativity of fluorine is greater

than that of chlorine.

17. Electron affinity depends on

(A) Atomic size

(B) Nuclear charge

(C) Atomic number

(D) Atomic size and nuclear charge both.

18. Two elements whose eletronegativities are 1.2

and 3.0, the bond formed between them would

be

(A) Ionic (B) covalent

(C) Coordinate (C) metallic.

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19. Ionic radii are

(A) Directly proportional to square of effective

nuclear charges

(B) Inversely proportional to effective nuclear

charge

(C) Inversely proportional to square of

effective nuclear charge

(D) Directly proportional to effective nuclear

charge.

20. Which of the following oxides is atmospheric in

character?

(A) CaO (B) CO2

(C) SiO2 (D) SnO2

21. Mark the correct statement:

(A) Na+ is smaller than Na atom

(B) Na+ is larger than Na atom

(C) CI- is smaller than CI atom

(D) CI- and CI are equal in size

22. Who introduced the zero groups?

(A) Lothar Meyer (B) Lockery

(C) Mendleev (D) Ramsay

23. Element, of group I-B are called

(A) Representative elements

(B) Transition elements

(C) Rare earth

(D) Coinage metals

24. The element with Z = 24 is placed in the period

(A) 5 (B) 2

(C) 3 (D) 4

25. Which is the part of metalloids?

(A) NA and K (B) F and CI

(C) None of these (D) Cu and Au

26. Which one of the following has the maximum

electron affinity?

(A) I (B) Br

(C) CI (D) F

27. On electrolysis of NaH, hydrogen is liberated

(A) At anode (B) in the electrolyte

(C) At cathode (D) none of them

28. Elements with greater number of electrons

have _________values of ionization energy.

a) Only one b) More than one

c) Zero d) Infinite

29. Which of the following possess maximum

hydration power?

a) Na+ b) K+

c) Mg+2 d) Ca+2

30. Higher value of electron affinity

means_________

a. Atom will lose electron easily

b. Atom will gain electron easily

c. Atom may form di-positive ion

d. The reason is unknown

31. Melting points of VII-A group ___________

down the group

a. Increase b Decrease

c. Remain constant d. No regular trend

32. Oxidation state of an atom represents______

a. No. of electrons gained

b. No. of electrons lost

c. No. of electrons gained or lost

d. None of above correctly represent it

33. Mendeleev’s periodic table was based on

a) Atomic number b) Atomic mass

c) Atomic volume d) Electronic configuration

34. Elements present in a same group have the

same

a) Atomic number

b) Molecular weight

c) Chemical properties

d) Electronic configuration

35. “s” and “p” block elements are also called

a) Transition elements

b) Inert elements

c) Typical elements

d) Rare earth elements

36. What is the symbol of the element with only

three electrons and three protons?

a) Li b) C

c) Ag d) Cu

37. Elements with seven electrons in their valence

shell are known as

a) Inert b) Lanthanides

c) Halogens d) Alkali metals

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38. Which of the following pairs of elements are

chemically most similar?

a) Na and Al b) Cu and Cu

c) S and F d) Sc and Zn

39. A student of chemistry will identify positively

the following symbols as sodium

a) W2

3

11

b) X4

0

19

c) Y2

6

13

d) Z3

2

16

40. In the periodic table each period begins with a

metal, which is

a) Most electronegative

b) Most electropositive

c) Less electropositive

d) Less electronegative

41. Which one of the following is not a coinage

metal?

a) Au b) Cu

c) Ag d) Pd

42. Which is the most metallic element of 2nd

period?

a) Lithium b) Beryllium

c) Boron d) Carbon

43. The outer most orbital involved in chemical

bonding is called

a) Molecular orbital b) Complete orbital

c) Valence orbital d) Free orbital

44. Elements, which form basic oxides are

a) Electropositive b) Electronegative

c) Inert d) None of these

45. Which of the following has the most basic

character?

a) Na2O b) MgO

c) Al2O3 d) P2O3

46. Which of the following is smallest in size?

a) K+1 b) O-2

c) F-1 d) Na+

47. Ionization energy is lowest for

a) Inert gases b) Halogens

c) Alkali metals d) Alkaline earth metals

48. An isotope of hydrogen is

a) Neptunium b) Plutonium

c) Thorium d) Tritium

49. With respect to chlorine, hydrogen will be

a) Electropositive b) Electronegative

c) Neutral d) None of these

50. Which of the following has the highest electron

affinity?

a) 1S2 2S2 2P3 b) 1S2 2S2 2P6 3S1

c) 1S2 2S2 2P5 d) 1S2 2S2 2P5

51. Excluding hydrogen and helium, the smallest

elements in the periodic table is

a) Lithium b) Fluorine

c) Cesium d) Iodine

52. Which halogen has the smallest electron

affinity?

a) F b) Cl

c) Br d) I

53. The element with atomic number 7 is likely to

have same properties to the element whose

atomic number is

a) 11 b) 2

c) 15 d) F

54. Which of the following will have largest size?

a) Br b) I -1

c) I d) F

55. In its chemical properties, calcium is most

similar to

a) Cs b) Cu

c) Sc d) Sr

56. Which two of the following are iso electronic

with one another?

a) Na+ and O b) Na+ and K+

c) Na+ and Ne d) Ne and O

57. Which of the following is a transuranic

element?

a) Americium b) Plutonium

c) Neptunium d) All of these

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58. The hydrogen, which is present in the

atmosphere of sun and stars in a large

amount, is

a) H2 b) H

c) H+ d) H-

59. Cesium and Francium are liquids above

a) 10oC b) 15oC

c) 20oC d) 30oC

60. In an aqueous solution the hydrides of alkali

metals are

a) Stable b) Unstable

c) No change d) None of these

61. As the atomic number of the halogen

increases, the halogens

a) Lose their outermost electrons less easily

b) Become less dense

c) Becomes lighter in color

d) Gain electrons less easily

62. The electron affinity of fluorine is

a) – 348.8 kj/mol b) – 337 kj/mol

c) 337 kj/mol d) 348.8 kj/mol

63. Which ionic halides have high m.p and b.p?

a) Fluoride b) Chloride

c) Bromide d) Iodide

64. Which gas is used in the making of tungsten

bulb filaments?

a) H2 b) N2

c) O2 d) CO2

65. The ionic halides in order of decreasing m.p

and b.p can be arranges as

a) Iodide>bromide>chloride> fluoride

b) Bromide>chloride>fluoride>iodide

c) Chloride>bromide>iodide>fluoride

d) Fluoride>chloride>bromide>iodide

66. A hydride ion and helium atom has same

number of

a) Protons b) Neutrons

c) Electrons d) All of these

67. Ionic hydrides are also called

a) Saline hydrides b) Salt like hydrides

c) Both a & b d) None of these

68. The hydrides are acts as powerful reducing

agents are

a) Ionic b) Covalent

c) Interstitial d) Complex

69. The hydrides which are non stoichiometric in

nature are

a) Ionic b) Covalent

c) Interstitial d) Complex

70. Which one is the example of complex hydride?

a) PH3 b) NaH

c) LaH3 d) NaBH4

71. The adsorption of hydrogen by platinum is

known as

a) Hydrogenation b) Dehydrogenation

c) Occlusion d) Substitution

72. From left to right in a periodic table charge to

mass ratio increases therefore the hydration

energy

a) Decreases b) Increases

c) Remains constant d) None of these

73. ______ elements have been discovered so

far.

a) 100 b) 110

c) 120 d) 150

74. _______ classified the then known elements

into metals, non metals and their derivatives.

a) Dobreiner b) Al – Razi

c) Newlands d) Mendeleeve

75. Dobreiner’s work led to the law of triads which

states that ______

a) Atomic weight of any one element was

found to be approximately the mean of the

other two elements of triad.

b) Atomic weight of the middle element was

found to be approximately the mean of the

other two elements of a triad.

c) Atomic number of any one element was

found to be approximately the mean of the

other two elements of a triad.

d) Atomic number of the middle element was

found t be approximately the mean of the

other two elements of a triad.

76. The law of octaves was given by _______

a) Dobreiner b) Al – Razi

c) Newlands d) None of these

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77. Law of octave states that ______

a) The properties of every 6th element from the

given one were similar to the first.

b) The properties of every 9th element from the

given one were similar to the first.

c) The properties of every 8th element from the

given one were similar to the first.

d) The properties of every 7th element from the

given one were similar to the second.

78. Mendeleev’s Periodic Table was based on

_______

a) Atomic number b) Atomic mass

c) Atomic volume d) Electronic configuration

79. Moseley’s work led to the periodic law, which

states that _______

a) The number of the electrons in the 1st

energy level increases as the atomic

number increases.

b) The properties of the elements are a

periodic function of their atomic mass.

c) The x – rays spectra of the elements are

more complex than the optical spectra.

d) The properties of elements are the periodic

function of their atomic number.

80. A pair of elements in the same family in the

periodic table classification is ________

a) Chlorine and carbon

b) Calcium and aluminum

c) Nitrogen and neon

d) Sodium and potassium

81. In the period, the elements are arranged in

strict sequence in order of _______

a) Increasing charges in the nucleus.

b) Increasing atomic weights.

c) Increasing number of electrons in valence

shell.

d) Increasing valency.

82. Uranium is a member of

a) s – block b) p – block

c) d – block d) f – block

83. How many ionization energies can carbon

have?

a) 1 b) 2

c) 4 d) 6

84. Which ion has the maximum polarization

power?

a) L+ b) Mg 2+

c) Al 3+ d) O 2-

85. Which of the following halides is not oxidized

by MnO2?

a) F b) Clc)

Br d) I

86. The process requiring absorption of energy is

a) F → F b) Cl → Cl

c) O → O2 d) H → H

87. Most of the known elements are metals of

______ of periodic table.

a) D – block b) P – block

c) III – group d) Zero block

88. The volume in cubic centimeters occupied by

one gram atom of the element is called

______

a) Atomic volume b) Atomic weight

c) Mass number d) None

89. The lowest ionization energies are found in the

_______

a) Inert gases b) Alkali metals

c) Transition elements d) Halogens

90. The unit of ionization energy is _______

a) Joule b) Calorie

c) Electron volt d) None

91. The electropositive elements form _____

a) Acidic oxides b) Basic oxides

c) Neutral oxides d) Amphoteric oxide

92. The electronegative elements form _____

a) Acidic oxides b) Basic oxides

c) Neutral oxides d) Amphoteric oxide

93. The ionization energy of nitrogen is more than

oxygen because of _______

a) More attraction of electrons by the nucleus

b) More penetration effect

c) The extra stability of half filled p – orbital

d) The size of nitrogen atom is smaller.

94. _______ ion has the largest radius.

a) Al+3 b) Cl-1

6

c) F-1 d) O-2

95. Ionic hydrides are usually _______

a) Liquids at room temperature

b) Good reducing agents

c) Good electrical conductors in solid state

d) Easily reduced.

96. The hydronium ion is a/an _______

a) Ion with formula H2O+

b) Ion with the formula H3O+

c) Free radical rather than an ion

d) Ion formed by removal of H- form a water

molecule.

97. When steam is passed over red hot coke at

1000oC, a mixture of carbon monoxide and

hydrogen gas is produced. It is known as

______

a) Heavy water b) Water gas

c) Phosgen gas d) None