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. |
Which is the last element of lanthanides? |
| A. | Ytterbium |
| B. | Lutetium |
| C. | Thulium |
| D. | Erbium |
| Answer» C. Thulium | |
| 2. |
Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number? |
| A. | La, Ce, Pr, Nd, Pm |
| B. | La, Pr, Ce, Pm, Nd |
| C. | La, Pr, Ce, Nd, Pm |
| D. | La, Ce, Pr, Pm, Nd |
| Answer» B. La, Pr, Ce, Pm, Nd | |
| 3. |
Which of the following lanthanide ions do not exhibit color? |
| A. | Lu<sup>+3</sup> and Ln<sup>+3</sup> |
| B. | Lu<sup>+2</sup> and Ln<sup>+2</sup> |
| C. | Ce<sup>+3</sup> and Ce<sup>+3</sup> |
| D. | Pr<sup>+4</sup> and Ce<sup>+4</sup> |
| Answer» B. Lu<sup>+2</sup> and Ln<sup>+2</sup> | |
| 4. |
Which of the following is not a property of lanthanides? |
| A. | They are soft metals with white silvery color |
| B. | They tarnish rapidly by air |
| C. | The hardness of the metals increases with increase in the atomic number |
| D. | The melting point of the metal ranges from 500-1000K |
| Answer» E. | |
| 5. |
In lanthanides, Ce changes from +4 to +3 oxidation state. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
What is the most common oxidation state of lanthanides? |
| A. | +2 |
| B. | +4 |
| C. | +6 |
| D. | +3 |
| Answer» E. | |
| 7. |
Which of the following is not a consequence of lanthanide contraction? |
| A. | From La<sup>+3</sup> to Lu<sup>+3</sup>, the ionic radii changes from 106 pm to 85 pm |
| B. | As the size of the lanthanide ions decreases the basic strength increases |
| C. | The basic character of oxides and hydroxides decreases with increase in atomic number |
| D. | The atomic radii of 4d and 5d series is similar |
| Answer» C. The basic character of oxides and hydroxides decreases with increase in atomic number | |
| 8. |
What happens to the atomic size of the lanthanides with increase in atomic number? |
| A. | The radius remains unchanged |
| B. | The radius decreases |
| C. | The radius increases |
| D. | The radius first increases and then decreases |
| Answer» C. The radius increases | |
| 9. |
What is the general electronic configuration of the lanthanides? |
| A. | (n-2)f <sup>1-14</sup> (n-1)d <sup>1-10</sup> ns<sup>2</sup> |
| B. | (n-2)f <sup>1-14</sup> (n-1)d <sup>1-2</sup> ns<sup>2</sup> |
| C. | (n-2)f <sup>1-14</sup> (n-1)d <sup>0-1</sup> ns<sup>2</sup> |
| D. | (n-2)f <sup>1-14</sup> (n-1)d <sup>0</sup> ns<sup>2</sup> |
| Answer» D. (n-2)f <sup>1-14</sup> (n-1)d <sup>0</sup> ns<sup>2</sup> | |
| 10. |
The lanthanides are d-block elements. |
| A. | True |
| B. | False |
| Answer» C. | |