1

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

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2

	Permanent hardness of water can be removed by adding
	A. chlorine B. washing soda C. potassium permanganate D. bleaching powder

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3

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

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4

	LPG consists of mainly
	A. methane, ethane and hexane B. ethane, hexane and nonane C. methane, hexane and nonane D. methane, butane and propane

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5

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