General Principles of Isolation of Elements

The reaction that does NOT take place in blast furnace between 900 K to 1500 K temperature range during extraction of iron is :

1. FeO+CO Fe+CO2
2. C+CO2 2CO
3. CaO+SiO2 CaSiO3
4. Fe2O3+CO 2FeO+CO2

Match List - I with List - II. Choose the correct answer from the options given below:

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

Which one of the following is not a calcination reaction?

1. CaCO3 + 2HCl CaCl2 + H2O + CO2
2. ZnCO3 ZnO + CO2
3. Fe2O3 . xH2O Fe2O3 + xH2O
4. CaCO3 . MgCO3 CaO + MgO + 2CO2

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)