Tungsten dioxide is a kind of chocolate-like powder. At 575~600℃, hydrogen will reduce tungsten trioxide to form tungsten dioxide. Tungsten dioxide is insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid. Nitric acid can oxidize tungsten dioxide into high-valent oxides. Tungsten dioxide is quickly oxidized to tungsten trioxide in air, and turns into blue oxide when heated to 500°C in nitrogen oxide. At 1020°C, tungsten dioxide can be reduced to metal tungsten by carbon.
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