MCQOPTIONS
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MCQOPTIONS
This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. |
| A. | 800-900 |
| B. | 50-80 |
| C. | 1000-1200 |
| D. | 250-400 |
| Answer» D. 250-400 | |
| 2. |
Heating of orthophosphoric acid to 250°C produces |
| A. | none of these |
| B. | metaphosphoric acid |
| C. | pyrophosphoric acid |
| D. | no change in it |
| Answer» D. no change in it | |
| 3. |
Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C. |
| A. | 950-1050 |
| B. | 250-300 |
| C. | 500-750 |
| D. | 1400-1450 |
| Answer» E. | |
| 4. |
Heating of orthophosphoric acid to about 900°C, produces |
| A. | metaphosphoric acid |
| B. | no change in it |
| C. | pyrophosphoric acid |
| D. | none of these |
| Answer» B. no change in it | |