- 1(current)
Q. No.
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Select the correct option based on statements below:
| Assertion (A): | Total number of octahedral voids present in the unit cell of cubic close packing including the one that is present at the body center, is four. |
| Reason (R): | Besides the body center there is one octahedral void present at the center of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells. |
| 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 Voids, Radius Ratio & Coordination Number |
Level 3: 35%-60%
Hints
Select the correct option based on statements below:
| Assertion (A): | In an hcp structure, each sphere is surrounded by eight other spheres. |
| Reason (R): | ABC, ABC ................................ represents hcp 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. | Both (A) and (R) are false. |
Subtopic: Â Voids, Radius Ratio & Coordination Number |
 64%
Level 2: 60%+
Hints
Match the type of packing given in Column I with the items given in Column II.
| Column I | Column II |
| A. Square close packing in two dimensions | 1. Triangular voids |
| B. Hexagonal close packing in two dimensions | 2. Pattern of spheres is repeated in every fourth layer |
| C. Hexagonal close packing in three dimensions | 3. Coordination number = 4 |
| D. Cubic close packing in three dimensions | 4. Pattern of sphere is repeated in alternate layers |
Codes
| A | B | C | D | |
| 1. | 3 | 2 | 4 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 3 | 1 | 4 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Â Voids, Radius Ratio & Coordination Number |
 66%
Level 2: 60%+
Hints
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