46.

In fireworks, the green flame is produced because of
A. sodium B. barium
C. mercury D. potassium
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
47.

Marsh gas is
A. nitrogen B. ethane
C. methane D. hydrogen
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
48.

Permanent hardness of water can be removed by adding
A. chlorine B. washing soda
C. potassium permanganate D. bleaching powder
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
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 and Explanation
Answer:D
Explanation: No answer description available for this question.
50.

Air is a/an
A. compound B. element
C. electrolyte D. mixture
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.