The most efficient packing is present in -

1. HCP and BCC

2. HCP and CCP

3. BCC and CCP

4. BCC and Simple cubic cell

Subtopic: Â Density & Packing Fraction |
Â 82%
From NCERT
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The percentage of empty space in a body centred cubic arrangement is ......... .

1.  74

2.  68

3.  32

4.  26

Subtopic: Â Density & Packing Fraction |
Â 83%
From NCERT
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The incorrect statement among the following regarding hexagonal close packing is:

 1 The coordination number is 12. 2 It has 74% packing efficiency. 3 Tetrahedral voids of the second layer are covered by the spheres of the third layer. 4 In this arrangement, spheres of the fourth layer are exactly aligned with those of the first layer.

Subtopic: Â Density & Packing Fraction |
Â 61%
From NCERT
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The correct order of the packing efficiency in different types of unit cells is-

1.  Fcc < Bcc < Simple cubic

2.  Fcc > Bcc > Simple cubic

3.  Fcc < Bcc > Simple cubic

4.  Bcc < Fcc > Simple cubic

Subtopic: Â Density & Packing Fraction |
Â 86%
From NCERT
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Select the correct option based on statements below:

 Assertion (A): The packing efficiency is maximum for the fcc structure. Reason (R): The coordination number is 12 in fcc structure.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.

Subtopic: Â Density & Packing Fraction |
Â 52%
From NCERT
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