Class 12 Exam > Class 12 Questions > One or More than One Options Correct TypeThis...
Start Learning for Free
One or More than One Options Correct Type
This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
Q.
In hexagonal close packing,
- a)packing efficiency is 74%
- b)the coordination number is 12
- c)tetrahedral voids of the second layer are covered by the spheres of the third layer
- d)spheres of the fourth layer are exactly aligned with those of the first layer
Correct answer is option 'A,B,C'. Can you explain this answer?
Most Upvoted Answer
One or More than One Options Correct TypeThis section contains 5 multi...
(a,b,c)
(a) r = radius, a = edge length
then for hcp, r = 
Volume of one spherical atom 
Number of atoms in one unit cell = 4
∴ Volume of four atoms 
Volume of cube = a3
∴ Packing efficiency = 
Thus, correct.
(b) In hep coordination number = 12, six at the diagonal and six at the edge length thus, correct.
(c) A tetrahedral void is formed when a sphere of a second layer is above the void of the first layer or vice-versa thus, correct.
Free Test
FREE
| Start Free Test |
Community Answer
One or More than One Options Correct TypeThis section contains 5 multi...
Explanation:
Hexagonal Close Packing (HCP):
Hexagonal close packing is a type of arrangement of spheres in which the spheres are arranged in a close-packed hexagonal lattice. In HCP, the spheres are arranged in a way that each sphere has 12 nearest neighbours.
Properties of HCP:
a) Packing efficiency is 74%:
In HCP, the packing efficiency is the ratio of the volume occupied by the spheres to the total volume of the unit cell. It is given by (π√3/2)/2 = 0.74 or 74%.
b) The coordination number is 12:
The coordination number is the number of nearest neighbors of a sphere. In HCP, each sphere has 12 nearest neighbors.
c) Tetrahedral voids of the second layer are covered by the spheres of the third layer:
In HCP, the second layer is placed over the first layer in such a way that the tetrahedral voids of the first layer are occupied by the spheres of the second layer. Similarly, the tetrahedral voids of the second layer are covered by the spheres of the third layer.
d) Spheres of the fourth layer are exactly aligned with those of the first layer:
In HCP, the fourth layer is placed over the third layer in such a way that the spheres of the fourth layer are exactly aligned with those of the first layer.
Conclusion:
Hence, the correct options are A, B and C.
Hexagonal Close Packing (HCP):
Hexagonal close packing is a type of arrangement of spheres in which the spheres are arranged in a close-packed hexagonal lattice. In HCP, the spheres are arranged in a way that each sphere has 12 nearest neighbours.
Properties of HCP:
a) Packing efficiency is 74%:
In HCP, the packing efficiency is the ratio of the volume occupied by the spheres to the total volume of the unit cell. It is given by (π√3/2)/2 = 0.74 or 74%.
b) The coordination number is 12:
The coordination number is the number of nearest neighbors of a sphere. In HCP, each sphere has 12 nearest neighbors.
c) Tetrahedral voids of the second layer are covered by the spheres of the third layer:
In HCP, the second layer is placed over the first layer in such a way that the tetrahedral voids of the first layer are occupied by the spheres of the second layer. Similarly, the tetrahedral voids of the second layer are covered by the spheres of the third layer.
d) Spheres of the fourth layer are exactly aligned with those of the first layer:
In HCP, the fourth layer is placed over the third layer in such a way that the spheres of the fourth layer are exactly aligned with those of the first layer.
Conclusion:
Hence, the correct options are A, B and C.
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer?
Question Description
One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer?.
One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer?.
Solutions for One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer?, a detailed solution for One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? has been provided alongside types of One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice One or More than One Options Correct TypeThis section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In hexagonal close packing,a)packing efficiency is 74%b)the coordination number is 12c)tetrahedral voids of the second layer are covered by the spheres of the third layerd)spheres of the fourth layer are exactly aligned with those of the first layerCorrect answer is option 'A,B,C'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup