Tungsten is extracted from its transition metal oxide ore on an industrial scale.
Name the primary raw material used as the source of hydrogen for the industrial extraction of tungsten.
State why carbon cannot be used as the reducing agent in the extraction of tungsten.
Explain how hydrogen gas, the reducing agent in this extraction, is produced from methane in a two-stage process. Include two chemical equations.
Write the balanced chemical equation for the reduction of tungsten(VI) oxide, WO3\text{WO}_3WO3, by hydrogen to produce tungsten metal and steam.
25 exam-style questions on Edexcel IGCSE Chemistry Extraction and uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.