Which one of the following nonmetals shows allotropy in the liquid state?
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Which of the following elements has the lowest melting point?
Acids that contain Hydrogen and other non-metallic element(s), except Oxygen, are called
____ is not an allotrope of carbon.
Which of the following is used in gunpowder?
What is dehydration?
Which is the most economical method of removing solid matter from water?
Glass is also called ________.