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. |
The elements present in a compound are determined by apparatus called ____________ |
| A. | analyzer |
| B. | CHN elemental analyzer |
| C. | chemical analyzer |
| D. | elemental analyzer |
| Answer» C. chemical analyzer | |
| 2. |
Estimation of oxygen can be determined by Carius method. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
In the estimation of sulphur, the organic compound is heated with ___________ in a carius tube. |
| A. | sodium hydroxide |
| B. | sodium peroxide |
| C. | potassium hydroxide |
| D. | calcium chloride |
| Answer» C. potassium hydroxide | |
| 4. |
Using Carius method, find out the percentage of bromine in the compound if 0.450 g of organic compound gave 0.200 g of AgBr. (Given: molar mass of Ag = 108; molar mass of Br = 80) |
| A. | 18% |
| B. | 17% |
| C. | 17.68% |
| D. | 18.91% |
| Answer» E. | |
| 5. |
In Kjedahl s method of estimation of nitrogen, the compound containing nitrogen is heated with __________ |
| A. | concentrated hydrochloric acid |
| B. | concentrated sulphuric acid |
| C. | nitric acid |
| D. | dilute hydrochloric acid |
| Answer» C. nitric acid | |
| 6. |
0.350 g of an organic compound gave 100 ml of nitrogen collected at 250 K temperature and 700 mm pressure. Calculate the percentage composition of nitrogen in the compound. Use Dumas method. |
| A. | 25.70% |
| B. | 35% |
| C. | 35.71% |
| D. | 36.88% |
| Answer» D. 36.88% | |
| 7. |
Dumas method is a method of estimation of nitrogen. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
The amounts of water can be detected by the increase in the mass of __________ during quantitative analysis of hydrogen. |
| A. | potassium hydroxide |
| B. | sodium hydroxide |
| C. | sodium chloride |
| D. | calcium chloride |
| Answer» E. | |
| 9. |
On complete combustion, 0.500 g of an organic compound gave 0.150 of carbon dioxide. Determine the percentage composition of carbon in the compound. |
| A. | 8.18% |
| B. | 81.8% |
| C. | 0.81% |
| D. | 81% |
| Answer» B. 81.8% | |
| 10. |
Carbon and hydrogen are detected by heating the compound with ____________ during quantitative analysis. |
| A. | carbon dioxide |
| B. | copper (II) oxide |
| C. | magnesium oxide |
| D. | sulphur dioxide |
| Answer» C. magnesium oxide | |