| 231. | Oxygen and ozone are |
A. allotropes | |
B. isotopes | |
C. isomers | |
D. isobars |
| 232. | Which of the following gases when passed through an alkaline solution of pyrogallol gives an orange solution? |
A. oxygen | |
B. nitrogen | |
C. hydrogen | |
D. Carbon dioxide |
| 233. | Which of the following gases blackens the surface of silver? |
A. ozone | |
B. hydrogen | |
C. oxygen | |
D. Carbon dioxide |
| 234. | Which of the following causes depletion of ozone layer in the atmosphere? |
A. green house gas | |
B. hydro fluorocarbon | |
C. chlorofluorocarbon | |
D. LPG |
| 235. | Which of the following gases is responsible for the depletion of ozone layer? |
A. nitrous oxide | |
B. chlorofluorocarbons | |
C. carbon dioxide | |
D. carbon monoxide |
| 236. | Supersonic aircraft discharge which of the following substances into the stratosphere? |
A. NOx | |
B. sox | |
C. CO₂ | |
D. H₂ |
| 237. | Which gas in the atmosphere absorbs ultraviolet rays? |
A. ozone | |
B. methane | |
C. nitrogen | |
D. helium |
| 238. | Ozone protects the biosphere |
A. from infra-red rays | |
B. from ultraviolet rays | |
C. X-rays | |
D. γ – from the rays |
| 239. | what kind of smell does ozone gas have |
A. like rotten eggs | |
B. like rotten flesh | |
C. like rotten fish | |
D. like mustard oil |
| 240. | The formula of Sulfur is – |
A. S | |
B. S₂ | |
C. S4 | |
D. S₈ |