How many number of water molecule (s) directly bonded to the metal centre in $CuS{O}_4 . 5H_{2}O$is

(1) 3

(2) 2

(3) 4

(4) 5

Iron is extracted from chalcopyrite as :

1. FeO
2. FeS
3. Fe₂O₃
4. FeSiO₃

A metal's oxide that can be reduced by Fe as a reducing agent at a temperature $T_1$ is:

1. Zr

2. Ca

3. Mg

4. None of the above.

Match the extraction processes listed in column I with metals listed in column II.

A.  (1-p,r) (2-p) (3-q) (4-s)

B.  (2-p,r) (1-p) (3-q) (4-r)

C.  (1-q,r) (2-p) (4-q) (3-s)

D.  (1-p) (2-p,r) (3-q) (4-q)

Extraction of metal from the ore cassiterite involves

(1) Carbon reduction of an oxide ore

(2) Self-reduction of a sulphide ore

(3) Removal of copper impurity

(4) Removal of iron impurity

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

(1) II, III in haematite and III in magnetite

(2) II, III in haematite and II in magnetite

(3) II in haematite and II, III in magnetite 

(4) III in haematite and II, III in magnetite 

Native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of:

1. Nitrogen

2. Oxygen

3. Carbon Dioxide

4. Argon

What method is used to extract zinc from zinc blende?

1. Electrolytic reduction

2. Roasting followed by reduction with carbon

3. Roasting followed by reduction with another metal

4. Roasting followed by self-reduction

Which ore contains both iron and copper ?

1. Cuprite

2. Chalcocite

3. Chalcopyrite

4. Malachite

The methods chiefly used for the extraction of lead and tin from their ores respectively:

(1) Self reduction and carbon reduction

(2) Self reduction and electrolytic reduction

(3) Carbon reduction and self reduction

(4) Cyanide process and carbon reduction