1
IIT-JEE 2012 Paper 2 Offline
MCQ (Single Correct Answer)
+2
-0.5
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
A
O2 and CO respectively
B
O2 and Zn dust respectively
C
HNO3 and Zn dust respectively
D
HNO3 and CO respectively
2
IIT-JEE 2011 Paper 2 Offline
MCQ (Single Correct Answer)
+1
-0.25
Oxidation states of the metal in the minerals haematite and magnetite, respectively are
A
II, III in haematite and III in magnetite
B
II, III in haematite and II in magnetite
C
II in haematite and II, III in magnetite
D
III in haematite and II, III in magnetite
3
IIT-JEE 2010 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper inculcated chalcanthite (CuSO$$_4$$ . 5H$$_2$$O), atacamite (Cu$$_2$$Cl(OH)$$_3$$), cuprite (Cu$$_2$$O), copper glance (Cu$$_2$$S) and malacite (Cu$$_2$$(OH)$$_2$$CO$$_3$$). However, 80% of the world copper production comes from the ore of chalcopyrite (CuFeS$$_2$$). The extraction of copper from chalcopynite involves partial roasting, removal of iron and self-reduction.

Partial roasting of chalcopyrite produces

A
Cu$$_2$$S and FeO
B
Cu$$_2$$O and FeO
C
CuS and Fe$$_2$$O$$_3$$
D
Cu$$_2$$O and Fe$$_2$$O$$_3$$
4
IIT-JEE 2010 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper inculcated chalcanthite (CuSO$$_4$$ . 5H$$_2$$O), atacamite (Cu$$_2$$Cl(OH)$$_3$$), cuprite (Cu$$_2$$O), copper glance (Cu$$_2$$S) and malacite (Cu$$_2$$(OH)$$_2$$CO$$_3$$). However, 80% of the world copper production comes from the ore of chalcopyrite (CuFeS$$_2$$). The extraction of copper from chalcopynite involves partial roasting, removal of iron and self-reduction.

Iron is removed from chalcopyrite as

A
FeO
B
FeS
C
Fe$$_2$$O$$_3$$
D
FeSiO$$_3$$
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