MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In the average composition of portland cement, the percentage of magnesium oxide is a ___________ |
| A. | 3 to 4% |
| B. | 2 to 3% |
| C. | 4 to 5% |
| D. | 1 to 2% |
| Answer» C. 4 to 5% | |
| 2. |
Which of the following is not a use of calcium chloro hypochlorite? |
| A. | Sterilization of water |
| B. | Manufacture of chloroform |
| C. | Germicide |
| D. | Painting |
| Answer» E. | |
| 3. |
What is the average percentage of available chlorine theoretically? |
| A. | 85 |
| B. | 49 |
| C. | 58 |
| D. | 66 |
| Answer» C. 58 | |
| 4. |
What is chloride of lime? |
| A. | Calcium sulphate |
| B. | Calcium chloro hypochlorite |
| C. | Calcium chloride |
| D. | Calcium hydroxide |
| Answer» C. Calcium chloride | |
| 5. |
Is the plaster of Paris useful in setting a solid mass? |
| A. | Yes |
| B. | No |
| C. | Maybe |
| D. | Cannot say |
| Answer» B. No | |
| 6. |
What is dead burnt plaster? |
| A. | Hexahydrate calcium sulphate |
| B. | Hemihydrate calcium sulphate |
| C. | Anhydrous calcium sulphate |
| D. | Decahydrate calcium sulphate |
| Answer» D. Decahydrate calcium sulphate | |
| 7. |
Gypsum is the same as plaster of Paris. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
Which of the following do you think is the correct formula for gypsum? |
| A. | CaSO<sub>4</sub>.2H<sub>2</sub>O |
| B. | CaSO<sub>4</sub>.1/2H<sub>2</sub>O |
| C. | CaSO<sub>4</sub>.H<sub>2</sub>O |
| D. | CaSO<sub>4</sub> |
| Answer» B. CaSO<sub>4</sub>.1/2H<sub>2</sub>O | |
| 9. |
Can limestone be prepared through slaked lime? |
| A. | Yes |
| B. | No |
| C. | Maybe |
| D. | Cannot say |
| Answer» B. No | |
| 10. |
Limestone is insoluble in water. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following compound is formed when slaked lime is treated with excess dioxide in the presence of water? |
| A. | Barium sulphate |
| B. | Calcium carbonate |
| C. | Calcium hydroxide |
| D. | Calcium bicarbonate |
| Answer» E. | |
| 12. |
What is the enthalpy of heat for dissolving quicklime and water? |
| A. | 55 kJ/mol |
| B. | 63 kJ/mol |
| C. | 75 kJ/mol |
| D. | 78 kJ/mol |
| Answer» C. 75 kJ/mol | |
| 13. |
Which of the following is not a compound of mortar? |
| A. | Phenol |
| B. | Quicklime |
| C. | Sand |
| D. | Water |
| Answer» B. Quicklime | |
| 14. |
Quicklime as same as calcium oxide. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Which of the following acid chemical formula first slaked lime? |
| A. | Calcium chloride |
| B. | Calcium oxide |
| C. | Calcium hydroxide |
| D. | Calcium carbonate |
| Answer» D. Calcium carbonate | |