Which one of the following is a disadvantage of phytoextraction?
It is a slow process as it depends on the rate of plant growth.
It requires a large input of electrical energy to heat the soil.
It is unable to extract metals from low-grade ores.
It releases large volumes of sulfur dioxide gas into the atmosphere.
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.