| Consider the following statements about Bioleaching. |
| 1. Bioleaching is the extraction of specific metals from their ores through the use of bacteria. |
| 2. Bioleaching is more environmentally friendly than traditional extraction methods. |
| 3. Toxic chemicals are sometimes produced in the process. Heavy ions such as iron, zinc and other arsenic leak during acid mine drainage. |
| Which of the statements given above are correct? |
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) All of these
Correct Answer: A
Solution :
Bioleaching is the extraction of specific metals from their ores through the use of bacteria. This is much cleaner than the traditional heap leaching using cyanide solution, Bioleaching comes under biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver and cobalt.
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