Phytoextraction can be used to extract nickel from low-grade ores.
The table shows five stages involved in this process.
| Stage | Process |
|---|---|
| 1 | Nickel is extracted from the ash using electrolysis or displacement. |
| 2 | The plants are harvested and burned to produce ash with a high concentration of nickel compounds. |
| 3 | A hyperaccumulator plant is grown in soil containing low-grade nickel ore. |
| 4 | Nickel ions accumulate in the leaves and shoots of the plants. |
| 5 | The roots of the plants absorb dissolved nickel ions from the soil. |
What is the correct order for the stages?
3,4,5,2,13, 4, 5, 2, 13,4,5,2,1
3,5,4,2,13, 5, 4, 2, 13,5,4,2,1
5,3,4,2,15, 3, 4, 2, 15,3,4,2,1
3,5,2,4,13, 5, 2, 4, 13,5,2,4,1
81 exam-style questions on OCR GCSE Chemistry Improving processes and products. Each one has a worked solution and a mark scheme showing where the marks go.