General Knowledge - General Science
Exercise :: General Science - Elements and Metals
| 46. |
In fireworks, the green flame is produced because of |
| A. |
sodium | | B. |
barium | | C. |
mercury | | D. |
potassium |
Answer: Option B
Explanation:
|
| 47. |
Permanent hardness of water can be removed by adding |
| A. |
chlorine | | B. |
washing soda | | C. |
potassium permanganate | | D. |
bleaching powder |
Answer: Option B
Explanation:
|
| 48. |
Marsh gas is |
| A. |
nitrogen | | B. |
ethane | | C. |
methane | | D. |
hydrogen |
Answer: Option C
Explanation:
|
| 49. |
LPG consists of mainly |
| A. |
methane, ethane and hexane | | B. |
ethane, hexane and nonane | | C. |
methane, hexane and nonane | | D. |
methane, butane and propane |
Answer: Option D
Explanation:
|
| 50. |
Air is a/an |
| A. |
compound | | B. |
element | | C. |
electrolyte | | D. |
mixture |
Answer: Option D
Explanation:
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