11. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
12. Which one element from below list is liquid at room temperature?
13. Which among the following elements is found in maximum percentage in the human body ?
14. Iodine can be separated from a mixture of Iodine and Potassium Chloride by
15. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
16. Which one among the following is not a mixture?
17. The gas used to dilute oxygen for breathing by deep sea divers is:
18. The most abundant element in the human body is
19. The most abundant element in the earth’s atmosphere is
20. Select the one which is not a mixture :
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