MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryMetallurgyPrevious Year Questions
In Cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents are respectively. (JIPMER 2017)
A.O2 and CO2
B.O2 and Zn dust✓ Correct
C.HNO3 and Zn dust
D.HNO3 and CO
Explanation
The extraction of silver involves cyanide process 2 2 2 2 i Ag S 2CN O 2 Ag CN SO -> 2 2 4 ii 2 Ag CN Zn Zn CN 2Ag -> Thus, in (i) O2-act as oxidizing agent (oxidise sulphide to SO2) and in (ii) Zn act as reducing (reduce Ag+ to Ag). 43. Considering Ellingham diagram, which of the following metals can be used to reduce alumina ? (NEET 2018) (a) Zn (b) Mg (c) Fe (d) Cu In metallurgy, Ellingham diagram is used to predict the ease of reduction of the metal oxides and sulphides to metals. The metal that is more reactive than aluminium can r
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