NaCl is an ionic solid having and Na Cl ions. Fe is a metallic solid, it exhibits high thermal and electrical conductivity, metallic luster and malleability. Graphite (c) is a covalent solid. Strong covalent bonds are present in between the C atoms in graphite. Dry ice is a molecular solid. Molecular crystals are those solids that are held together by van der Waals forces. Hence the correct answer is option (b)
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