General Science - Questions (Section-1)
46Air is a/an
A. compoundB. element
C. electrolyte D. mixture
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47In fireworks, the green flame is produced because of
A. sodiumB. barium
C. mercury D. potassium
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48LPG consists of mainly
A. methane, ethane and hexaneB. ethane, hexane and nonane
C. methane, hexane and nonane D. methane, butane and propane
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49Marsh gas is
A. nitrogenB. ethane
C. methane D. hydrogen
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50Permanent hardness of water can be removed by adding
A. chlorineB. washing soda
C. potassium permanganate D. bleaching powder
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