Kossel - Lewis Approach to Chemical Bond Formation NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Kossel - Lewis Approach to Chemical Bond Formation MCQ Questions


13.
The total number of valence electrons available for bonding in CH₄ molecule is:
A.
10
B.
4
C.
6
D.
8
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ANSWER :
D. 8
14.
For drawing Lewis structure of CO₃²⁻ ion, the total number of valence electrons is:
A.
26
B.
22
C.
20
D.
24
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ANSWER :
D. 24
15.
In NF₃ molecule, the central atom is:
A.
Nitrogen
B.
Fluorine
C.
Both
D.
None
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ANSWER :
A. Nitrogen
16.
The formal charge on the central oxygen atom in O₃ (ozone) molecule is:
A.
0
B.
+1
C.
-1
D.
+2
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ANSWER :
B. +1
17.
The formal charge of an atom in a polyatomic molecule is calculated as:
A.
Valence electrons - Lone pair electrons - ½(Bonding electrons)
B.
Valence electrons + Lone pair electrons - ½(Bonding electrons)
C.
½(Valence electrons) - Lone pair electrons - Bonding electrons
D.
Valence electrons - ½(Lone pair electrons) - Bonding electrons
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ANSWER :
A. Valence electrons - Lone pair electrons - ½(Bonding electrons)
18.
Which Lewis structure is preferred when multiple structures are possible?
A.
The one with minimum bonds
B.
The one with maximum lone pairs
C.
The one with smallest formal charges
D.
The one with highest formal charges
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ANSWER :
C. The one with smallest formal charges