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Solution:concept - Litharge is one of the natural mineral forms of lead oxide, . Litharge is a secondary mineral that results from the oxidation of galena ores.
They form as coatings and incrustations with an internal tetragonal crystal structure. It is dimorphic with the orthorhombic massicot form. It forms soft, red, oily crusts with a very high specific gravity of 9.14–9.35. can be prepared by heating metallic lead in the air at about 600 °C (lead only melts at 300 °C). At this temperature, it is also the end product of heating other lead oxides in the air. This is often done with a set of bellows that pump air over the molten lead, causing the oxidised product to slide or fall from the top into the vessel, where it quickly solidifies in tiny flakes.
Hence, the correct option is (3).