MCQOPTIONS
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MCQOPTIONS
This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is Raoult’s law applicable to, in order to determine molar masses correctly? |
| A. | Ionic solute in liquid |
| B. | Non-ionic solute in dilute solution |
| C. | Non-ionic solute in concentrated solution |
| D. | Ionic solid in insoluble form in solvent |
| Answer» C. Non-ionic solute in concentrated solution | |
| 2. |
Two components A and B have their pure vapor pressures in the ratio 1 ∶ 4 and respective mole fractions in solution in ratio 1 ∶ 2. What is the mole fraction of component B in vapor phase? |
| A. | 0.8889 |
| B. | 0.1250 |
| C. | 0.8000 |
| D. | 0.2000 |
| Answer» B. 0.1250 | |
| 3. |
When 2.0 grams of copper (II) nitrate is added to 1000 ml of pure water, by how much is the vapor pressure of water decreased, given that at 20°C the vapor pressure of pure water is 17.535 mm Hg? |
| A. | 3.1 x 10-4 |
| B. | 0.303 |
| C. | 0.0333 |
| D. | 0.0033 |
| Answer» E. | |
| 4. |
If 1.5 grams of a non-volatile solute (MW = 100) is added to 200 ml pure CS2 (ρ = 1.3 g/cc) whose vapor pressure is 400 mm of Hg at 28.0°C, what is the resulting vapor pressure of the dilute solution? |
| A. | 401.246 mm Hg |
| B. | 398.754 mm Hg |
| C. | 401.754 mm Hg |
| D. | 398.246 mm Hg |
| Answer» E. | |