Four shiny solids are labeled A, B, C, and D. Given the following information about the solids, deduce the identity of A, B, C, and D.
(1) The solids are a graphite rod, a silver bar, a lump of “fool’s gold” (iron sulfide), and iodine crystals.
(2) B, C, and D are insoluble in water. A is slightly soluble.
(3) Only C can be hammered into a sheet.
(4) C and D conduct electricity as solids; B conducts when melted; A does not conduct as a solid, melted, or dissolved in water.
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