41. Which one of the following is the permanent gas in the atmosphere?
42. The electronic configuration of hydrogen is similar to which of the following?
43. Which gas is produced when a metal reacts with water?
44. Which of the following is used to disinfect drinking water?
45. Which of the following Allotropes of carbon is used to absorb impurities and bad odors from water and other substances?
46. What is the atomicity of sulphur?
47. Pure water can be obtained from sea water by
48. How many oxygen atoms are in a molecule of oxygen?
49. Red phosphorus is used in the manufacture of safety matches. This is due to the fact that
50. The elements of group 18 are . . . . . . . .
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