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