31. A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
32. An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :
33. The metals commonly used for electroplating are
34. In galvanization, iron is coated with
35. The process of improving the quality of rubber by heating it with sulphur is called
36. Rusting of iron takes place due to
37. Combustion of a candle is a/an
38. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?
39. Candle is a mixture of
40. Coal is formed from
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