In one industrial process, chromium(III) oxide, Cr2O3\text{Cr}_2\text{O}_3Cr2O3, is used as a catalyst.
Based on the position of chromium in the periodic table, which row in the table shows the most likely melting point of chromium and the colour of chromium oxide?
| Melting point of chromium in ∘C^\circ\text{C}∘C | Colour of chromium oxide | |
|---|---|---|
| A | 98 | white |
| B | 1907 | white |
| C | 98 | green |
| D | 1907 | green |
Melting point: 98 ∘C98\ ^\circ\text{C}98 ∘C; Colour: white
Melting point: 1907 ∘C1907\ ^\circ\text{C}1907 ∘C; Colour: white
Melting point: 98 ∘C98\ ^\circ\text{C}98 ∘C; Colour: green
Melting point: 1907 ∘C1907\ ^\circ\text{C}1907 ∘C; Colour: green
97 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.