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:
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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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