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CBSE
Class 11 Chemistry
Classification Of Elements And Periodicity In Properties
Quiz 1
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The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:
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Both are found together in nature
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Both have nearly the same size
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Both have similar electronic configuration
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The ratio of their charge and size (i. e. charge density) is nearly the same
Explanation
The ratio of their charge and size (i. e. charge density) is nearly the same
The element with atomic number 35 belongs to
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d – Block
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f – Block
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p – Block
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s – Block
Explanation
p – Block
The correct order of first ionization potential among following elements, Be, B, C, N and O is
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B < Be < C < O < N
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B < Be < C < N < O
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Be < B < C < N < O
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Be < B < C < O < N
Explanation
B < Be < C < O < N
Representative elements are those which belong to
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p and d – Block
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s and d – Block
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s and p – Block
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s and f – Block
Explanation
s and p – Block
Which of the following properties generally decreases along a period?
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Ionization Energy
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Metallic Character
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Electron Affinity
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Valency.
Explanation
Metallic Character
On the Paulings electronegativity scale the element next to F is
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N
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Cl
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O
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Ne.
Explanation
O
The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:
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16, 5 and 2
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15, 5 and 3
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16, 6 and 3
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15, 6 and 2
Explanation
15, 5 and 3
Which of the following oxides is amphoteric in character?
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SnO
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CO
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SiO
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CaO
Explanation
SnO
In the modern periodic table, the period indicates the value of:
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Atomic Number
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Atomic Mass
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Principal Quantum Number
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Azimuthal Quantum Number
Explanation
Principal Quantum Number
In the long form of the periodic table, the valence shell electronic configuration of 5s²5p
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Group 16 and period 6
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Group 17 and period 6
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Group 16 and period 5
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Group 17 and period 5
Explanation
Group 16 and period 5
Arrange S, O and Se in ascending order of electron affinity
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Se < S < O
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Se < O < S
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S < O < Se
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S < Se < O
Explanation
Se < S < O
In the modern periodic table , the period indicates the value of:
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Atomic Number
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Atomic Mass
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Principal Quantum Number
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Azimuthal Quantum Number
Explanation
Principal Quantum Number
The electronic configuration of an element is 1s², 2s² 2p, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table
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31
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34
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33
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49
Explanation
33
The reduction in atomic size with increase in atomic number is a characteristic of elements of-
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d−block
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f−block
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Radioactive series
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High atomic masses
Explanation
f−block
The number of elements in the 5th period of the periodic table is
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3
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9
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8
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18
Explanation
18
Which of the following forms the most stable gaseous negative ion?
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F
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Cl
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Br
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I
Explanation
Cl
On the Paulings electro negativity scale the element next to F is
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N
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Cl
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O
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Ne.
Explanation
O
The element californium belongs to a family of :
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Alkali metal family
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Actinide series
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Alkaline earth family
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Lanthanide series
Explanation
Actinide series
Increasing order of electro negativity is
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Bi < P < S < Cl
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P < Bi < S < Cl
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S < Bi < P < Cl
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Cl < S < Bi < P
Explanation
Bi < P < S < Cl
The electronic configuration of halogen is
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ns² np
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ns²
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(i) and (ii)
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None of the above
Explanation
ns² np
0 h : 0 m : 1 s
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