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During refining of liquid iron to steel, CaO plays various roles, out there which of the following is most important

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Important Questions on Transition and Inner Transition Elements

EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Among statements (a) – (d), the correct ones are :
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond’s process.
(d) Zr and Ti are purified by Van Arkel method.
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Among the reactions a-d, the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:
a CaO+SiO2→CaSiO3
b 3Fe2O3+CO→2Fe3O4+CO2
c FeO+SiO2→FeSiO3
d FeO→Fe+12O2
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Cast iron is used for the manufacture of :
MEDIUM
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
The final step for extraction of copper from copper pyrite in bessemer converter involves the reaction
HARD
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Which series of reactions correctly represents the chemical relations related to iron and its compound?
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
In the context of the Hall-Heroult process for the extraction of Al, which of the following statement is incorrect.
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
The purest form of commercial iron is:
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron

Match the following 

   List - I     List - II
(a) Copper (i) Bauxite
(b) Iron (ii) Malachite
(c) Zinc (iii) Haematite
(d) Aluminium (iv) Calamine
    (v) Galena

The correct answer is

EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Name the process that is employed to refine aluminium.
MEDIUM
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
The form of iron obtained from blast furnace is :
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Hall Heroult's process is given by:
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
The molecular formula of malachite ore is:
MEDIUM
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Identify the correct statement from the following:
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Copper is extracted from copper pyrites by
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Which among following processes occurs at 1500 K in blast furnace for extraction of iron 
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
What happens during bessemerization process of extraction of copper from copper pyrites?
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
Extraction of copper by smelting uses silica as an additive to remove.
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:
EASY
Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Extraction of iron
In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of: