Elements Classification and Chemical Bonding CDS Questions

CDS Chemistry

Elements Classification and Chemical Bonding MCQ Questions


13.
Dobereiner's Law of Triads grouped elements with similar properties such that the atomic weight of the middle element was approximately equal to:
A.
Product of the other two
B.
Difference of the other two
C.
Average of the other two
D.
Sum of the other two
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ANSWER :
C. Average of the other two
14.
Hydrogen shows anomalous/dual behaviour in the periodic table because it resembles:
A.
Only alkali metals
B.
Only noble gases
C.
Both alkali metals and halogens
D.
Only halogens
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ANSWER :
C. Both alkali metals and halogens
15.
Elements such as Lithium and Magnesium, belonging to different groups but showing similar chemical properties due to similar charge/radius ratios, exhibit:
A.
Periodicity
B.
Isomerism
C.
Triad relationship
D.
Diagonal relationship
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ANSWER :
D. Diagonal relationship
16.
On moving from left to right across a period, the atomic radius of elements generally:
A.
Decreases
B.
Increases
C.
Remains constant
D.
First increases then decreases
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ANSWER :
A. Decreases
17.
On moving down a group, the atomic radius of elements generally:
A.
Increases
B.
Becomes zero
C.
Decreases
D.
Remains the same
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ANSWER :
A. Increases
18.
Ionization enthalpy (energy) generally shows which trend across a period from left to right?
A.
Becomes negative
B.
Increases
C.
Decreases
D.
Remains unchanged
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ANSWER :
B. Increases