Valence Shell Electron Pair Repulsion (VSEPR ) Theory and Shapes of Simple Molecules NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Valence Shell Electron Pair Repulsion (VSEPR ) Theory and Shapes of Simple Molecules MCQ Questions


1.
VSEPR theory was originally proposed by:
A.
Sidgwick and Powell
B.
Hund and Mulliken
C.
Pauling and Slater
D.
Heitler and London
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ANSWER :
A. Sidgwick and Powell
2.
According to VSEPR theory, the shape of a molecule depends upon:
A.
Only the number of lone pairs around the central atom
B.
The total number of valence shell electron pairs (bonded and non-bonded) around the central atom
C.
The atomic number of the central atom
D.
Only the number of bond pairs around the central atom
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ANSWER :
B. The total number of valence shell electron pairs (bonded and non-bonded) around the central atom
3.
The order of repulsion between different types of electron pairs is:
A.
lp-bp > lp-lp > bp-bp
B.
lp-lp > lp-bp > bp-bp
C.
bp-bp > lp-bp > lp-lp
D.
bp-bp > lp-lp > lp-bp
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ANSWER :
B. lp-lp > lp-bp > bp-bp
4.
Which of the following is NOT a postulate of VSEPR theory?
A.
Lone pairs occupy less space than bond pairs
B.
Electron pairs in the valence shell repel one another
C.
Electron pairs occupy positions in space that minimize repulsion
D.
A multiple bond is treated as if it is a single electron pair
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ANSWER :
A. Lone pairs occupy less space than bond pairs
5.
In VSEPR theory, when there are 2, 3, 4, 5, and 6 electron pairs around the central atom (no lone pairs), the geometries are respectively:
A.
Bent, trigonal pyramidal, tetrahedral, square pyramidal, octahedral
B.
Linear, trigonal planar, square planar, trigonal bipyramidal, octahedral
C.
Linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral
D.
Linear, tetrahedral, trigonal planar, octahedral, trigonal bipyramidal
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ANSWER :
C. Linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral
6.
The shape of BeCl₂ molecule (in gas phase) is:
A.
Trigonal planar
B.
Bent
C.
Linear
D.
Tetrahedral
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ANSWER :
C. Linear