General Principles of Isolation of Elements

The maximum temperature that can be achieved in blast furnace is :

1. Upto 5000 K
2. Upto 1200 K
3. Upto 2200 K
4. Upto 1900 K

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

1. Zone refining
2. Electrolysis
3. Chromatography
4. Distillation

Identify the correct statement from the following :

1. Blister copper has blistered appearance due to evolution of CO2
2. Vapour phase refining is carried out for Nickel by Van Arkel method.
3. Pig iron can be moulded into a variety of shapes.
4. Wrought iron is impure iron with 4\% carbon.

Which one is malachite from the following?

1. Fe3O4
2. CuCO3 Cu(OH)2
3. CuFeS2
4. Cu(OH)2

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

1. Fe
2. Zn
3. Mg
4. Cu

Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by

1. distillation
2. zone refining
3. displacement with Zn
4. liquation

Match items of Column I with the items of Column II and assign the correct code :

1. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
2. (a)-(iii), (b)-(iv), (c)-(v), (d)-(i)
3. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(v)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

1. carbon monoxide
2. copper (I) sulphide
3. sulphur dioxide
4. iron (II) sulphide

"Metals are usually not found as nitrates in their ores." Out of the following two (I and II) reasons which is/are true for the above observation? I. Metal nitrates are highly unstable. II. Metal nitrates are highly soluble in water.

1. I is false but II is true.
2. I is true but II is false.
3. I and II are true.
4. I and II are false

The metal oxide which cannot be reduced to metal by carbon is

1. Al2O3
2. PbO
3. ZnO
4. Fe2O3