Chemistry Class 9 Chapter 3 Important mcqs Federal Board
Periodic Table and Periodicity of Properties Important Multiple Choice Questions
1) Total number of periods in the periodic table are ___.
A) 7
B) 8
C) 11
D) 10
Answer: A (7)
2) An element whose last electron enters into s-subshell is a ___ block element.
A) p
B) d
C) s
D) f
Answer: C (s)
3) Which one of the following group contains halogens?
A) I A
B) II A
C) VII A
D) VII B
Answer: C (VII A)
4) Group II A elements are also called ___.
A) Alkali metal
B) Alkaline earth metals
C) Carbon family
D) Halogens
Answer: B (Alkaline earth metals)
5) An element of 2nd period has __ number of shells.
A) 6
B) 4
C) 3
D) 2
Answer: D (2)
6) Valence shell electronic configuration of Oxygen is 2s2, 2p4, it is a member of group ___
A) II A
B) VI A
C) III A
D) VIII A
Answer : B ( VI A)
7) Main group elements are arranged into ___ groups.
A) 3
B) 6
C) 5
D) 8
Answer: D (8)
8) Period number of S1632 is ___
A) 3
B) 4
C) 5
D) 6
Answer: A (3)
9) Which of the following element belongs to Group VII A?
A) O
B) N
C) C
D) F
Answer: D (F)
10) Group VIII A elements are called ___.
A) Halogens
B) Alkaline earth metals
C) Oxygen family
D) Noble gases
Answer: D (Noble gases)
11) s and p block elements are also called ___ elements.
A) Transition metals
B) Inert
C) Representative
D) None of them
Answer: C (Representative)
12) Elements of the same group have same ___ properties.
A) Chemical
B) Physical
C) Both chemical and physical
D) None of them
Answer: A (Chemical)
13) Hydrogen is a member of ___ period .
A) 2
B) 4
C) 6
D) 1
Answer: D (1)
14) Elements of the same ___ has same number of valence shell electrons.
A) Period
B) Group
C) House
D) None of them
Answer: B ( Group )
15) Boron Family is the name of Group ___ .
A) IVA
B) III A
C) V A
D) VIA
Answer: B ( IIIA)
16) By the end of 18th century , ___ elements were known .
A) 23
B) 47
C) 39
D) 68
Answer: A (23)
17) Atomic number was discovered by Moseley in ___.
A) 1990
B) 1913
C) 1880
D) 2009
Answer: B (1913)
18) It was noticed that _____ could serve as a base for the systematic arrangement of elements.
A) Atomic mass
B) Neutron number
C) Atomic number
D) none of them
Answer: C ( Atomic number )
19) The horizontal rows of the periodic table are called ____.
A) Groups
B) Table
C) Bond
D) Periods
Answer: D (Periods)
20) Number of elements in the fifth period are ___
A) 2
B) 8
C) 18
D) 32
Answer: C (18)
21) Group B elements are called ____ elements.
A) Normal
B) Transition
C) Main group
D) None of them
Answer: B (Transition)
22) Mg is present in which group?
A) I A
B) II A
C) III A
D) IV A
Answer: B (II A)
23) An element has 5 valence shell electrons, it is a member of which group?
A) II A
B) III A
C) IV A
D) V A
Answer: D ( VA)
24) Al 13 is a member of which period ?
A) 1ST
B) 2ND
C) 3RD
D) 4TH
Answer: C (3rd )
25) ____ properties depend on the sizes of the atoms.
A) Chemical
B) Physical
C) Neurological
D) None of them
Answer: B (Physical)
26) Which one of the following has greater shielding effect?
A) Li
B) Na
C) K
D) H
Answer: C (K)
27) As we move from top to bottom in a group shielding effect ___.
A) Stays constant
B) Decreases
C) Both a and b
D) Increases
Answer: D (Increases)
28) As we move from left to right in a period the number shells in elements ___.
A) stays constant
B) Increases
C) Decreases
D) None of them
Answer: A ( stays constant)
29) Shielding effect of Sn is greater than which of the following?
A) Cs
B) C
C) Rn
D) Po
Answer: B (C)
30) Which one of the following pair of elements has the same number of valence shell electrons?
A) Li, B
B) K, Ne
C) O, S
D) None of them
Answer: C (O,S )
31) The size of an atom depends upon its
A) Electronic configuration
B) Chemical properties
C) Periodic table
D) None of them
Answer: A (Electronic configuration)
32) Which one of the following has the smallest atomic size?
A) K
B) Al
C) H
D) Po
Answer: C (H)
33) The atomic radius __ in any given period as you move across the period.
A) Decreases
B) Increases
C) remains same
D) None of them
Answer: A (Decreases)
34) The atomic radius ___ in any given group as you move from top to bottom.
A) Decreases
B) Increases
C) remains same
D) None of them
Answer: B (Increases)
35) Which one of the following has the largest atomic size?
A) Ne
B) Xe
C) Sn
D) Fr
Answer: D (Fr)
36) Which one of the following has the highest ionization energy?
A) Li
B) Be
C) B
D) C
Answer: C ( C )
37) Which one of the following has higher ionization energy as compared to Ne?
A) F
B) He
C) H
D) Li
Answer: B (He)
38) Ionization energy ___ as we move from left to right in a period.
A) Increases
B) Decreases
C) Remains same
D) None of them
Answer: A (Increases)
39) Ionization energy is a measure of the extent to which the nucleus ____ the outermost electron.
A) Repels
B) Compress
C) Attracts
D) None of them
Answer: C (Attracts)
40) Greater shielding effects results in a _____ attraction of the nucleus for the valence electrons.
A) Greater
B) Higher
C) Constant
D) Weaker
Answer: D (Weaker)
41) Electron affinity explains the ____ formation.
A) Anion
B) Cation
C) Molecule
D) None of them
Answer: A (Anion)
42) As you move from left to right across a period, the electron affinity generally ____.
A) Decreases
B) Increases
C) Remains same
D) None of them
Answer: B (Increases)
43) Due to increase in _____ added electron binds less tightly to the nucleus.
A) Electronegativity
B) Shielding effect
C) Ionization energy
D) None of them
Answer: B (Shielding effect)
44) Electronegativity is the ability of an atom to attract the ____ towards itself in a chemical bond.
A) Proton
B) Neutron
C) Electron
D) All of them
Answer: C (Electron)
45) Which of the following has the highest electronegativity?
A) F
B) O
C) S
D) H
Answer: A (F)
46) Which one of the following has the same electronegativity as Nitrogen?
A) F
B) S
C) Cl
D) H
Answer: C (Cl)
47) Electron affinity is the amount of energy ____ when an electron is added in the valence shell of an isolated atom to form uninegative gaseous ion.
A) Absorbed
B) Released
C) Emitted
D) Both b and c
Answer: D (Both b and c)
48) Xe belongs to which group?
A) III A
B) IV A
C) V A
D) VIII A
Answer: D ( VIII A )
49) Which of the following has the largest atomic size?
A) Rb
B) Sr
C) In
D) Sn
Answer: A (Rb)
50) Which one of the following has the highest ionization energy?
A) H
B) Ne
C) Ar
D) He
Answer: D (He)
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