Final answer:
The use of hydrogen gas in the reduction of tungsten oxide indicates that tungsten is extracted as a solid. Tungsten is a transition metal with a high melting point and low reactivity.
Step-by-step explanation:
When hydrogen gas is used in the reduction of tungsten oxide to extract tungsten metal, it indicates that tungsten metal is reduced from its oxide form to its elemental form.
This process involves heating the tungsten oxide in the presence of hydrogen gas, which acts as a reducing agent. The chemical reduction reaction typically produces tungsten as a solid and water vapor as a byproduct, thereby suggesting that option B) Tungsten metal is a solid is the correct deduction.
Tungsten is a transition metal, and these metals have a wide range of chemical behaviors. Some transition metals are strong reducing agents while others, like tungsten, have low reactivity and high melting points.
This is why the extraction process does not result in tungsten in a gas or liquid state but as a solid that can be physically removed and utilized.