| 41. | In whose atmosphere is the magnesium wire placed in the flash bulb? |
A. hydrogen | |
B. oxygen | |
C. ozone | |
D. nitrogen |
| 42. | The gas used in electric bulbs is |
A. nitrogen | |
B. hydrogen | |
C. oxygen | |
D. none of these |
| 43. | discoverer of nitrogen |
A. chadwick | |
B. rutherford | |
C. cavendish | |
D. ramje |
| 44. | cryogenic fluid |
A. liquid nitrogen | |
B. liquid ammonia | |
C. dry ice | |
D. liquid sulfur dioxide |
| 45. | Which of the following elements is required in the largest amount by growing plants? |
A. calcium | |
B. nitrogen | |
C. iron | |
D. phosphorus |
| 46. | Which of the following gas is present in the largest quantity in the air? |
A. Carbon dioxide | |
B. nitrogen | |
C. argon | |
D. oxygen |
| 47. | The explosive compound of nitrogen is – |
A. NCI₃ | |
B. N₂O₅ | |
C. NH₃ | |
D. NF₃ |
| 48. | Which of the following fertilizers has the highest percentage of nitrogen? |
A. urea | |
B. ammonium sulfate | |
C. ammonium nitrate | |
D. calcium nitrate |
| 49. | Which gas is produced when there is lightning in the sky? |
A. N₂O | |
B. NO | |
C. NO₂ | |
D. N₂O₅ |
| 50. | Which one of the following gases is produced during the formation of photochemical smog? |
A. hydrogen | |
B. Nitrogen oxide | |
C. ozone | |
D. methane |