chemistry : class12 Unit Cell : Ionic solids : Solid State MCQ Questions and Answers
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Unit Cell
MCQ questions and answers.
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MCQ Questions
1. What is the smallest repeating unit of a crystal lattice called?
A.
Unit cell
B.
Molecule
C.
Coordination sphere
D.
Crystal face
Correct Answer:
Unit cell
Explanation:
A unit cell is the smallest repeating portion of a crystal lattice that generates the entire crystal when repeated in three dimensions.
2. How many particles does a particle at a corner of a unit cell contribute to that unit cell?
A.
1
B.
1/2
C.
1/4
D.
1/8
Correct Answer:
1/8
Explanation:
A corner particle is shared by eight unit cells, so its contribution to one unit cell is 1/8.
3. A particle present at the centre of a face of a unit cell contributes how much to that unit cell?
A.
1
B.
1/2
C.
1/4
D.
1/8
Correct Answer:
1/2
Explanation:
A face-centred particle is shared equally by two adjacent unit cells, so it contributes 1/2 to one unit cell.
4. A particle located at the body centre of a unit cell contributes how much to that unit cell?
A.
1/8
B.
1/4
C.
1/2
D.
1
Correct Answer:
1
Explanation:
A body-centred particle lies completely inside one unit cell, so its entire contribution is 1.
5. How many particles are effectively present in a primitive unit cell?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
1
Explanation:
A primitive unit cell has particles only at its corners. The eight corner contributions together equal one particle.
6. How many particles are effectively present in a body-centred cubic unit cell?
A.
1
B.
2
C.
4
D.
8
Correct Answer:
2
Explanation:
A body-centred cubic unit cell contains one particle from the eight corners and one particle at the body centre, giving a total of two particles.
7. How many particles are effectively present in a face-centred cubic unit cell?
A.
2
B.
3
C.
4
D.
6
Correct Answer:
4
Explanation:
In a face-centred cubic unit cell, the corners contribute one particle and the six face-centred particles contribute three, giving four particles in total.
8. In a unit cell, particles are present only at the eight corners. What type of unit cell is this?
A.
Primitive unit cell
B.
Body-centred unit cell
C.
Face-centred unit cell
D.
End-centred unit cell
Correct Answer:
Primitive unit cell
Explanation:
A primitive unit cell has particles only at its corners, with no particles at the body centre or face centres.
9. In an ionic unit cell, if each corner contains one ion, how many ions are contributed by all eight corners together?
A.
1 ion
B.
2 ions
C.
4 ions
D.
8 ions
Correct Answer:
1 ion
Explanation:
Each corner ion contributes 1/8, so eight corner ions contribute 8 × 1/8 = 1 ion to the unit cell.
10. Which feature is repeated in all directions to form a crystal from a unit cell?
A.
The unit cell
B.
Only the corner ion
C.
Only the body-centre ion
D.
Only the face ion
Correct Answer:
The unit cell
Explanation:
Translational repetition of the unit cell in three dimensions produces the complete crystal structure.
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