1
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$$_3$$
2
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$$_3$$
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.

In self-reduction, the reducing species is

A
S
B
O$$^{2-}$$
C
S$$^{2-}$$
D
SO$$_2$$
4
IIT-JEE 2008 Paper 2 Offline
MCQ (Single Correct Answer)
+4
-1

Match the conversions in Column I with the type(s) of reaction(s) given in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $$\times$$ 4 matrix given in the ORS.

Column I Column II
(A) PbS $$\to$$ PbO (P) roasting
(B) CaCO$$_3$$ $$\to$$ CaO (Q) Calcination
(C) ZnS $$\to$$ Zn (R) carbon reduction
(D) Cu$$_2$$S $$\to$$ Cu (S) self reduction

A
A $$\to$$ (p); B $$\to$$ (q); C $$\to$$ (p); D $$\to$$ (s)
B
A $$\to$$ (q); B $$\to$$ (p); C $$\to$$ (r); D $$\to$$ (p, s)
C
A $$\to$$ (p); B $$\to$$ (q); C $$\to$$ (p, r); D $$\to$$ (p, s)
D
A $$\to$$ (p); B $$\to$$ (q, s); C $$\to$$ (p, r); D $$\to$$ (p)
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