91. Solid substance commonly known as 'dry ice':
92. Which of the following is not an inert/nobel gas?
93. In . . . . . . . . allotrope of carbon , the carbon atoms are arranged in the shape of a football.
94. . . . . . . . . is the greatest source of halogens.
95. Which of the following is the only non-metallic substance present in liquid state at room temperature?
96. . . . . . . . . gas is also produced by reaction of acids upon metals.
97. In the modern periodic table, what are the basic elements of group 18 (Except helium all other than having eight electrons in their outermost orbit)?
98. . . . . . . . . is the least reactive element of group-17.
99. What is the first element that was chemically discovered by the Hanning brand?
100. Which of the following gases makes up 78% of our atmosphere and also a part of many element essential to life?
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