Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity Questions Answers

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1 Question 20. Increasing order of electro negativity is
A Bi < P < S < Cl
B P < Bi < S < Cl
C S < Bi < P < Cl
D Cl < S < Bi < P

Answer:Bi < P < S < Cl
2 The element californium belongs to a family of :
A Alkali metal family
B Actinide series
C Alkaline earth family
D Lanthanide series

Answer: Actinide series
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3 On the Paulings electro negativity scale the element next to F is
A N
B Cl
C O
D Ne.

Answer:O
4 Which of the following forms the most stable gaseous negative ion?
A F
B Cl
C Br
D I

Answer:Cl
5 The electronic configuration of halogen is
A ns² np6
B ns² np3
C ns² np5
D ns²

Answer: ns² np5
6 The number of elements in the 5th period of the periodic table is
A 3
B 9
C 8
D 18

Answer: 18
7 The reduction in atomic size with increase in atomic number is a characteristic of elements of-
A d−block
B f−block
C Radioactive series
D High atomic masses

Answer:f−block
8 The electronic configuration of an element is 1s², 2s² 2p6, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table
A 31
B 34
C 33
D 49

Answer:33
9 In the modern periodic table , the period indicates the value of:
A Atomic Number
B Atomic Mass
C Principal Quantum Number
D Azimuthal Quantum Number

Answer: Principal Quantum Number
10 Arrange S, O and Se in ascending order of electron affinity
A Se < S < O
B Se < O < S
C S < O < Se
D S < Se < O

Answer: Se < S < O
11 In the long form of the periodic table, the valence shell electronic configuration of 5s²5p4 corresponds to the element present in:
A Group 16 and period 6
B Group 17 and period 6
C Group 16 and period 5
D Group 17 and period 5

Answer:Group 16 and period 5
12 In the modern periodic table, the period indicates the value of:
A Atomic Number
B Atomic Mass
C Principal Quantum Number
D Azimuthal Quantum Number

Answer:Principal Quantum Number
13 Which of the following oxides is amphoteric in character?
A SnO2
B CO2
C SiO2
D CaO

Answer:SnO2
14 The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:
A 16, 5 and 2
B 15, 5 and 3
C 16, 6 and 3
D 15, 6 and 2

Answer: 15, 5 and 3
15 On the Paulings electronegativity scale the element next to F is
A N
B Cl
C O
D Ne.

Answer: O
16 Which of the following properties generally decreases along a period?
A Ionization Energy
B Metallic Character
C Electron Affinity
D Valency.

Answer: Metallic Character
17 Representative elements are those which belong to
A p and d – Block
B s and d – Block
C s and p – Block
D s and f – Block

Answer:s and p – Block
18 The correct order of first ionization potential among following elements, Be, B, C, N and O is
A B < Be < C < O < N
B B < Be < C < N < O
C Be < B < C < N < O
D Be < B < C < O < N

Answer: B < Be < C < O < N
19 The element with atomic number 35 belongs to
A d – Block
B f – Block
C p – Block
D s – Block

Answer:p – Block
20 The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:
A Both are found together in nature
B Both have nearly the same size
C Both have similar electronic configuration
D The ratio of their charge and size (i.e. charge density) is nearly the same

Answer: The ratio of their charge and size (i.e. charge density) is nearly the same

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