general science general knowledge questions

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46. In fireworks, the green flame is produced because of
A. sodium B. barium
C. mercury D. potassium

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.
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:

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48. Marsh gas is
A. nitrogen B. ethane
C. methane D. hydrogen

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: Option D

Explanation:

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50. Air is a/an
A. compound B. element
C. electrolyte D. mixture

Answer: Option D

Explanation:

No answer description available for this question.

 

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