general science questions

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:

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