41. The first metal used by man was
42. The hydronium ion is
43. The most electropositive elements among the following is
44. The method that cannot be used for removing permanent hardness of water is
45. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
46. The gas used for artificial ripening of green fruit is
47. Zone refining is used for the purification of
48. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
49. The molecule which has the highest percentage of ionic character among the following is
50. The high reactivity of fluorine is due to
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