Which one of the following nonmetals shows allotropy in the liquid state?
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The common name of dichlorodifluoromethane is _____.
The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
Which of the following elements has the lowest melting point?
Terylene is a condensation polymer of ethylene glycol and which acid?
NaCl has ______.
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