A certain solid substance that is very hard, has a high melting point, and is nonconducting unless melted is most likely to be A) Cr B) NO₂ C) NaCl D) I₂ E) H₂O

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NaCl (sodium chloride) is a solid ionic compound that is very hard, has a high melting point, and does not conduct electricity unless it is melted or dissolved in water, which allows its ions to move freely.

A Certain Solid Substance That Is Very Hard, Has a High