91. Diamonds are glittering and attractive because light incident on them undergoes
92. If lime water is kept in the air, it turns milky due to presence of :
93. Diamond is harder than graphite because of :
94. The gas used to extinguish fire is
95. Which among the following coal contains 90 per cent of carbon?
96. One carat of diamond is equal to
97. Carbon dioxide is
98. Hardest allotrope of carbon is
99. Diamond is lustrous because
100. Dry ice is
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