| 191. | The gas which burns with blue flame is – |
A. hydrogen | |
B. nitrogen | |
C. carbon monoxide | |
D. Carbon dioxide |
| 192. | Which of the following air pollutant dissolves more rapidly in the hemoglobin of blood than oxygen? |
A. PAN | |
B. carbon dioxide | |
C. carbon monoxide | |
D. ozone |
| 193. | What is the amount of carbon dioxide in the air in the following |
A. 0.003%’ | |
B. 0.03%’ | |
C. 0.13%’ | |
D. 30%’ |
| 194. | Which of the following gas is essential for photosynthesis process |
A. carbon monoxide | |
B. Carbon dioxide | |
C. nitrogen | |
D. oxygen |
| 195. | The main method by which carbon dioxide gas is reduced in the environment is |
A. catalyst | |
B. electrolysis | |
C. compilation | |
D. Photosynthesis |
| 196. | Which gas is used by plants in photosynthesis |
A. sulfur dioxide | |
B. Carbon dioxide | |
C. chlorine | |
D. ammonia |
| 197. | It is not advisable to sleep under a tree at night, because then – |
A. carbon dioxide is released | |
B. carbon monoxide is released | |
C. less oxygen is released | |
D. more oxygen is released |
| 198. | Carbon dioxide reacts with water to form |
A. carbolic acid | |
B. carbonic acid | |
C. carboxylic acid | |
D. sulfuric acid |
| 199. | The gas used to extinguish the fire is |
A. Neon | |
B. nitrogen | |
C. Carbon dioxide | |
D. carbon monoxide |
| 200. | Due to the presence of which lime water turns milky when exposed to air? |
A. Carbon dioxide | |
B. nitrogen | |
C. oxygen | |
D. sulfur dioxide |