Some metals occur naturally in their elemental state while others occur as compounds in ores. Gold, for instance, is found as the free metal; mercury is obtained by heating mercury(II) sulfide ore in oxygen; and zinc is obtained by heating zinc(II) oxide ore with coke (carbon). Judging from their positions in the activity series, which of the metals sil-ver, platinum, and chromium would probably be obtained by (c) heating its oxide with coke?

Video transcript

Hello. In this problem we are told that metals in nature can be found as free metals and some are found in yours as compounds for example, platinum can be found as an isolated metal. Copper can be extracted from copper to sulfide or by roasting in the presence of air and zinc can be extracted from zinc to oxide by reduction with carbon. Were asked to refer to the activity series to identify which of the following metals could be extracted from its oxide via reduction with carbon. Looking at the activity series we see that I think is towards the top and we're told that it can be extracted from its ore by reduction with carbon. We then have copper which is towards the bottom. We're told that it can be extracted from sulfide ores by roasting the presence of air and then at the very bottom we have platinum. Platinum. Then we're told can be isolated as a metal. Within our list were provided, gold, gold appears beneath platinum. So it is most likely to exist as a free metal. Up at the top we have potassium and calcium closer to the top, the more reactive these are two oxidation and then we have iron which falls beneath zinc. So that means then that iron is more prone to reduction than zinc and be extracted from its oxide by reduction with carbon. So the correct answer then is B Thanks for watching. Hope this helps