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. |
I = _________ |
| A. | m<sub>e</sub>v<sup>2</sup>r |
| B. | m<sub>e</sub>vr<sup>2</sup> |
| C. | m<sub>e</sub>r |
| D. | m<sub>e</sub>vr |
| Answer» E. | |
| 2. |
Which of the following is the value for Rydberg constant? |
| A. | 2.95 x 10<sup>-18</sup> J |
| B. | -2.95 x 10<sup>-18</sup> J |
| C. | -2.18 x 10<sup>-18</sup> J |
| D. | 2.18 x 10<sup>-18</sup> J |
| Answer» D. 2.18 x 10<sup>-18</sup> J | |
| 3. |
The energy of a hydrogen atom is positive. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Calculate the wavelength of a photon that traveled from 5th orbit to 2nd orbit. |
| A. | 434 nm |
| B. | 456 nm |
| C. | 863 nm |
| D. | 268 nm |
| Answer» B. 456 nm | |
| 5. |
Bohr s model could not explain the ability of atoms to form molecules by ______ |
| A. | Attraction |
| B. | Physical bonds |
| C. | Chemical bonds |
| D. | Polarity |
| Answer» D. Polarity | |
| 6. |
Bohr s model couldn t explain Zeeman and stark effect. |
| A. | False |
| B. | True |
| Answer» C. | |
| 7. |
What s the radius of 1st orbit of He+ atom? |
| A. | 0.1058 nm |
| B. | 0.2156 nm |
| C. | 0.00529 nm |
| D. | 0.02645 nm |
| Answer» E. | |
| 8. |
What is the ratio of the atomic radius of the 5th orbit in chlorine atom and 3rd orbit in Helium atom? |
| A. | 153:50 |
| B. | 50:153 |
| C. | 153:100 |
| D. | 100:153 |
| Answer» C. 153:100 | |
| 9. |
The energy of 1st orbit in a hydrogen atom __________ |
| A. | 3.18 10<sup> 12</sup> J |
| B. | 2.18 10<sup> 18</sup> J |
| C. | 3.18 10<sup> 18</sup> J |
| D. | 2.18 10<sup> 18</sup> J |
| Answer» C. 3.18 10<sup> 18</sup> J | |
| 10. |
Angular momentum of an electron is quantized. |
| A. | True |
| B. | False |
| Answer» B. False | |