31. Which of the following is not a method of preparing oxygen?
32. Which one of the following statements is not correct? Vulcanisation of rubber makes it
33. The compounds formed when hydrogen combines with p-block elements are called
34. In vulcanisation process, rubber can be hardened by adding
35. The substance that is added to make natural rubber strong and more bouncy is
36. In arc welding, Argon is used because of its
37. An inert gas mixed with oxygen given to patients suffering from restricted breathing is
38. Which of the following elements is obtained from seaweeds ?
39. Silica gel is a
40. Silicon is a
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