21. Which of the following is also used as a lubricant?
22. The maximum valency of halogen group with respect to oxygen is . . . . . . . .
23. What is the chemical formula of phosphoric acid?
24. What are the elements related to group 17?
25. Heavy water' is a term related to which of the following?
26. Which one of the following pairs is incorrectly matched?
27. The foul smell of dead fish is due to the compound
28. . . . . . . . . is an example of monoatomic molecule.
29. Which of the following elements is polyatomic molecules?
30. Which of the following gases has the highest energy value (calorific value)?
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