| 291. | The gas which is used in the formation of vegetation is – |
A. oxygen | |
B. nitrogen | |
C. hydrogen | |
D. Carbon dioxide |
| 292. | The main source of producer of nitrogen containing fertilizers is |
A. ammonia | |
B. nitric acid | |
C. nitrogen | |
D. Nitrogen oxide |
| 293. | The chemical formula of laughing gas is – |
A. NO | |
B. N₂O | |
C. NO₂ | |
D. N₂O₃ |
| 294. | Which of the following is responsible for common heating? |
A. methane | |
B. Carbon dioxide | |
C. water vapour | |
D. All of the above |
| 295. | Which of the following is a green gas |
A. Carbon dioxide | |
B. sulfur dioxide | |
C. methane | |
D. All of the above |
| 296. | Three elements which are used most in chemical fertilizers – |
A. Nitrogen, Sodium, Sulfur | |
B. Nitrogen, Potassium, Phosphorus | |
C. Nitrogen, Phosphorus, Sodium | |
D. calcium, sodium, sulfur |
| 297. | What is dry ice? |
A. solid carbon dioxide | |
B. liquid carbon dioxide | |
C. ice cubes and sawdust | |
D. ice cubes and salt |
| 298. | Which of the following cleans the polluted atmosphere? |
A. oxygen | |
B. Rain | |
C. nitrogen | |
D. Air |
| 299. | Steam coal gas is a mixture of |
A. carbon dioxide and hydrogen | |
B. carbon monoxide and nitrogen | |
C. carbon monoxide and hydrogen | |
D. carbon dioxide and nitrogen |
| 300. | Which of the following is not a greenhouse |
A. methane | |
B. nitrous oxide | |
C. chloro fluoro carbon | |
D. hydrogen |