MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If copper, density = 9.0 g/cm3 and atomic mass 63.5, bears face-centered unit cells then what is the ratio of surface area to volume of each copper atom? |
| A. | 0.0028 |
| B. | 0.0235 |
| C. | 0.0011 |
| D. | 0.0323 |
| Answer» C. 0.0011 | |
| 2. |
If metallic atoms of mass 197 and radius 166 pm are arranged in ABCABC fashion then what is the surface area of each unit cell? |
| A. | 1.32 10<sup>6</sup> pm<sup>2</sup> |
| B. | 1.32 10<sup>-18</sup>pm<sup>2</sup> |
| C. | 2.20 10<sup>5</sup> pm<sup>2</sup> |
| D. | 2.20 10<sup>-19</sup> pm<sup>2</sup> |
| Answer» B. 1.32 10<sup>-18</sup>pm<sup>2</sup> | |
| 3. |
How many atoms surround the central atom present in a unit cell with the least free space available? |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» E. | |
| 4. |
What are the percentages of free space in a CCP and simple cubic lattice? |
| A. | 52% and 74% |
| B. | 48% and 26% |
| C. | 26% and 48% |
| D. | 74% and 52% |
| Answer» D. 74% and 52% | |
| 5. |
The packing efficiency can never be 100% . Is this true or false? |
| A. | False |
| B. | True |
| Answer» C. | |
| 6. |
Which of the following metals would have the highest packing efficiency? |
| A. | Copper |
| B. | Potassium |
| C. | Chromium |
| D. | Polonium |
| Answer» B. Potassium | |
| 7. |
If the body-centered unit cell is assumed to be a cube of edge length a with spherical particles of radius r then how is the diameter, d of particle and surface area, S of the cell related? |
| A. | S = 32d<sup>4</sup>/3 |
| B. | S = 2d<sup>2</sup> |
| C. | S = 4d<sup>2</sup> |
| D. | S = 8d<sup>2</sup> |
| Answer» E. | |
| 8. |
Arrange the types of arrangement in terms of decreasing packing efficiency. |
| A. | BCC < Simple cubic < CCP |
| B. | HCP < CCP < BCC |
| C. | HCP < BCC < Simple cubic |
| D. | CCP < BCC < HCP |
| Answer» D. CCP < BCC < HCP | |
| 9. |
What is the dimensional formula of packing fraction? |
| A. | M<sup>0</sup>L<sup>3</sup>T<sup>0</sup> |
| B. | M<sup>0</sup>L<sup>0</sup>T<sup>0</sup> |
| C. | ML<sup>0</sup>T<sup>0</sup> |
| D. | M<sup>0</sup>L<sup>2</sup>T<sup>0</sup> |
| Answer» C. ML<sup>0</sup>T<sup>0</sup> | |
| 10. |
What does the ratio space occupied/total space denote? |
| A. | Packing factor |
| B. | Packing efficiency |
| C. | Particle fraction |
| D. | Packing unit |
| Answer» B. Packing efficiency | |