chemistry : class12 Octahedral Voids : Crystalline solids : Solid State MCQ Questions and Answers
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Octahedral Voids
MCQ questions and answers.
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MCQ Questions
1. An octahedral void in a crystal lattice is surrounded by how many particles?
A.
Four
B.
Six
C.
Eight
D.
Twelve
Correct Answer:
Six
Explanation:
An octahedral void is formed when six particles surround an empty space, giving it a coordination number of six.
2. Where is an octahedral void located in a face-centred cubic unit cell?
A.
At the body centre
B.
At the corners
C.
At the face centres
D.
Outside the unit cell
Correct Answer:
At the body centre
Explanation:
In a face-centred cubic unit cell, the body-centre position is an octahedral void.
3. How many octahedral voids are present in one face-centred cubic unit cell?
A.
One
B.
Two
C.
Four
D.
Eight
Correct Answer:
Four
Explanation:
An FCC unit cell has one octahedral void at the body centre and twelve at the edge centres, each edge void contributing one-fourth. Thus, the total is 1 + 12 × 1/4 = 4.
4. If a crystal lattice contains N particles, how many octahedral voids are generally present?
A.
N/2
B.
N
C.
2N
D.
4N
Correct Answer:
N
Explanation:
The number of octahedral voids in a close-packed lattice is equal to the number of particles present.
5. Which type of void has a coordination number of six?
A.
Tetrahedral void
B.
Octahedral void
C.
Cubic void
D.
Linear void
Correct Answer:
Octahedral void
Explanation:
An octahedral void is surrounded by six particles, so its coordination number is six.
6. In a cubic close-packed arrangement, the octahedral void at the body centre is surrounded by particles located at which positions?
A.
Only the corners
B.
The centres of the six faces
C.
Only the edge centres
D.
The body centres of neighbouring cells
Correct Answer:
The centres of the six faces
Explanation:
The body-centre octahedral void is surrounded by six particles situated at the centres of the six faces of the unit cell.
7. What is the shape associated with the arrangement of particles around an octahedral void?
A.
Tetrahedral
B.
Trigonal planar
C.
Octahedral
D.
Linear
Correct Answer:
Octahedral
Explanation:
Six surrounding particles are arranged symmetrically around the void, producing an octahedral arrangement.
8. In a close-packed structure containing 10 particles, how many octahedral voids are expected?
A.
5
B.
10
C.
20
D.
40
Correct Answer:
10
Explanation:
The number of octahedral voids equals the number of particles in the close-packed structure, so 10 particles give 10 octahedral voids.
9. Which position in a simple cubic unit cell corresponds to the location of an octahedral void when similar particles occupy the corners?
A.
The body centre
B.
The corner
C.
The centre of an edge
D.
The centre of a face
Correct Answer:
The body centre
Explanation:
The body-centre position in a cubic arrangement can be regarded as an octahedral void surrounded by particles along the relevant directions.
10. Compared with a tetrahedral void, an octahedral void can accommodate a particle that is generally:
A.
Smaller
B.
Larger
C.
Exactly the same size in every case
D.
Unable to fit any particle
Correct Answer:
Larger
Explanation:
An octahedral void is larger than a tetrahedral void because it is surrounded by six particles and provides more space for an inserted particle.
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