____ is not an allotrope of carbon.
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The common name of dichlorodifluoromethane is _____.
Terylene is a condensation polymer of ethylene glycol and which acid?
Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with
Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
Which one of the following nonmetals shows allotropy in the liquid state?
Which is the most economical method of removing solid matter from water?
Which of the following elements has the lowest melting point?