Periodic Table and Periodicity AFCAT Questions

AFCAT Chemistry

Periodic Table and Periodicity MCQ Questions


1.
Which of the following correctly describes the trend in atomic radius across a period from left to right?
A.
Remains constant as the period number is fixed
B.
Decreases due to increase in effective nuclear charge
C.
First increases then decreases
D.
Increases due to addition of new shells
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ANSWER :
B. Decreases due to increase in effective nuclear charge
2.
The atomic radius generally increases down a group in the periodic table because:
A.
Atomic mass decreases down the group
B.
Principal quantum number increases and shielding by inner electrons increases
C.
Nuclear charge decreases down the group
D.
Number of valence electrons decreases
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ANSWER :
B. Principal quantum number increases and shielding by inner electrons increases
3.
Which of the following has the largest atomic radius?
A.
Li
B.
K
C.
Na
D.
Cs
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ANSWER :
D. Cs
4.
Which element among the following has the smallest atomic radius?
A.
F
B.
B
C.
Be
D.
Li
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ANSWER :
A. F
5.
The covalent radius of chlorine is 99 pm. The bond length in Cl2 molecule is:
A.
297 pm
B.
49.5 pm
C.
198 pm
D.
99 pm
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ANSWER :
C. 198 pm
6.
Why are the atomic radii of noble gases not directly comparable with covalent radii of other elements?
A.
Because noble gases are monoatomic and their radii are van der Waals radii
B.
Because noble gases are unstable
C.
Because noble gases have variable atomic radii
D.
Because noble gases are highly reactive
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ANSWER :
A. Because noble gases are monoatomic and their radii are van der Waals radii