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16.	Bleaching powder contains
	A. nitrogen B. iodine C. chlorine D. bromine

17.	Which one of the following gases is readily soluble in water at room temperature?
	A. chlorine B. nitrogen C. ammonia D. carbon dioxide

18.	Radon is
	A. germon radio B. inert gas C. artificial fibre D. an explosive

19.	pH of water is
	A. 4 B. 7 C. 12 D. 18

20.	pH of blood is
	A. 4 B. 6.4 C. 7.4 D. 8

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