| 46. | In fireworks, the green flame is produced because of |
| a. | sodium |
| b. | barium |
| c. | mercury |
| d. | potassium |
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Answer: (b).barium
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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 |
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Answer: (b).washing soda
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| 48. | Marsh gas is |
| a. | nitrogen |
| b. | ethane |
| c. | methane |
| d. | hydrogen |
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Answer: (c).methane
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| 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 |
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Answer: (d).methane, butane and propane
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| 50. | Air is a/an |
| a. | compound |
| b. | element |
| c. | electrolyte |
| d. | mixture |
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Answer: (d).mixture
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