71. Which one of following is water gas?
72. . . . . . . . . is not a allotrope of carbon
73. Which one of the following non-metals shows allotropy in the liquid state?
74. Carbongen is
75. . . . . . . . . is an inert gas
76. What is the commen in Helium and Argon?
77. Which of the following element is a greenish yellow gas with a characteristic odor at room temperature?
78. Which of the following can exist in different forms?
79. Which one of the following is not alkaline?
80. Which one of the following gases is colourless and odorless?
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