超一流化学高手、化学专家请进(Periodicity0037)请用英文解答(该题是要用英文解的答化学题,不是翻译题).(a)Explainwhyasampleofiron(II)oxide(FeO)willnothaveaniron(II)tooxygenmoleratioof1:1.(b)Goldisa

Question

超一流化学高手、化学专家请进(Periodicity 0037)
请用英文解答(该题是要用英文解的答化学题,不是翻译题).
(a)Explain why a sample of iron(II) oxide (FeO) will not have an iron(II) to oxygen mole ratio of 1:1.
(b)Gold is a very important mineral.The gold ore is mixed with cyanide solution to leech the gold into solution to form a complex,after which the gold is then obtained by reduction of the complex.
(1)State the complex formed.
(2)Give an example of a reducing agent to obtain gold.
Thanks.

Answer 1

a) ease of oxidizing Fe(II) to Fe(III)
b)[Au(CN)2]-
reducing techniques:
* Carbon in pulp
* Merrill-Crowe process
* Electrowinning
* Resin in pulp