Valence NEET Questions

Inorganic Chemistry - Classification of Elements and Periodicity in Properties

Valence MCQ Questions


13.
In Mendeleev's periodic table, the general formula of the oxide formed by elements of Group I was:
A.
RO₂
B.
RO
C.
R₂O₃
D.
R₂O
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ANSWER :
D. R₂O
14.
In the modern periodic table, elements are arranged into 18 vertical columns called groups, and elements within the same group have the same number of:
A.
Protons
B.
Total electrons
C.
Valence electrons (and hence generally the same valency)
D.
Neutrons
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ANSWER :
C. Valence electrons (and hence generally the same valency)
15.
The modern periodic table successfully resolved the anomalies of Mendeleev's classification related to variable valency because it is based on:
A.
Physical appearance of elements
B.
Atomic number and electronic configuration, rather than atomic mass
C.
Melting and boiling points alone
D.
Atomic mass alone
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ANSWER :
B. Atomic number and electronic configuration, rather than atomic mass
16.
Across a period in the modern periodic table (from left to right), the valency of representative (main group) elements with respect to hydrogen first increases from 1 to 4, and then:
A.
Continues to increase up to 8
B.
Decreases from 4 to 0
C.
Stays constant at 4
D.
Becomes negative
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ANSWER :
B. Decreases from 4 to 0
17.
Down a group in the modern periodic table, the valency of elements generally:
A.
Decreases steadily
B.
Increases steadily
C.
Becomes zero for all elements
D.
Remains the same, since the number of valence electrons does not change
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ANSWER :
D. Remains the same, since the number of valence electrons does not change
18.
The classification of elements in the long form (modern) periodic table is primarily based on their:
A.
Physical appearance
B.
Electronic configuration, particularly the valence shell configuration
C.
Radioactive properties
D.
Boiling points
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ANSWER :
B. Electronic configuration, particularly the valence shell configuration