21. Seaweeds are important source of
22. Sea weeds are important source of
23. The strongest oxidizing agent among the following is:
24. Helium is added to the oxygen supply of deep sea divers because it is
25. Vulcanization of rubber is carried out by adding
26. Hamburger effect is otherwise known as–
27. The inert gas used as beacon light is
28. The noble gas used in radiotherapy is
29. Inert gases are
30. Which one of the following does not form oxyacid ?
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