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46. | In fireworks, the green flame is produced because of |
A. |
sodium |
B. |
barium |
C. |
mercury |
D. |
potassium |
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Answer:B
Explanation: No answer description available for this question.
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47. | Marsh gas is |
A. |
nitrogen |
B. |
ethane |
C. |
methane |
D. |
hydrogen |
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Answer:C
Explanation: No answer description available for this question.
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48. | 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
Explanation: No answer description available for this question.
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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
Explanation: No answer description available for this question.
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50. | Air is a/an |
A. |
compound |
B. |
element |
C. |
electrolyte |
D. |
mixture |
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Answer:D
Explanation: No answer description available for this question.
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