Cryolite is an ore of

An ore of potassium is

Which one of the following is the most abundant element in the universe

Cassiterite is an ore of

Iron loses magnetic property at

Which one of the following is an ore of aluminium

Which one of the following ores is a chloride

Corundum is an ore of

Aluminium is most abundant in earth crust yet it is obtained from bauxite because

Copper pyrites are concentrated by

Froth-floatation method is successful in separating impurities from ores because

In the metallurgy of zinc, flux is not used because

Ores like magnetite or tungsstates in tin ores are concentrated by

CN^– solution used in extraction of which metal

An ore like zinc blende is concentrated by

The process used of the  extraction of sodium is called

Which statement is correct

Roasting of copper pyrites ores is for the following purposes

In the smelting of roasted copper pyrites ore, melting occurs so that the first reaction is

(A) All the sulphur preferentially combines with iron to form FeS and CuO
(B) All the sulphur preferentially combines with copper to form  CuS and FeO 
(C) All the sulphur preferentially  combines with iron to form FeS and Cu₂O
(D) All the sulphur preferentially combines with copper to form Cu₂S and FeO

Silica is added to roasted copper ore during smelting in order to remove

When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then

The impurities associated with minerals used in metallurgy are collectively called

The process of roasting of an ore is carried out in the

Flux is used to remove

Monds process is used for

Bessemer converter is used of

Which of the following is not a mineral of iron

Roasting involves

Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide

Roasting is done in

Sodium metal is extracted by

Cryolite is used in the extraction of

Which metal is used as a reducing agent in smelting

During extraction of Fe slag obtained is

(A) FeO                        (B) FeSiO₃                         (C) MgSiO₃                    (D) CaSiO₃

Alumino-thermic process is used for metallurgy of

In Goldschmidt aluminothermic process, thermite contains

(A) 3 parts of Al₂O₃ and 4 parts of Al
(B) 3 parts of Fe₂O₃ and 2 parts of Al
(C) 3 parts of Fe₂O₃ and 1 part of Al
(D) 1 part of Fe₂O₃ and 1 part of Al

Which of the following is slag

(A) CaO                         (B) CaSO₄                        (C) CaSiO₃                         (D) SiO₂

A metal obtained directly by roasting of its sulphide ore is

Calcination is used in metallurgy for removal of

(A) Water and sulphide                                      (B) Water and CO₂
(C) CO₂ and H₂S                                                   (D) H₂O and H₂S

Thomas slag is

(A) CaSiO₃                       (B) Ca₃(PO₄)₂                          (C) MnSiO₃                               (D) CaCO₃

In the hope’s process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because

For the electrolytic refining of aluminium, the three fused layers consist of

For purification of alumina, the modern processes most useful when (i) the impurities present is a lot of iron oxides and (ii) the impurities present is a lot of silica, are

Electric refining is used for refining of

MacArther process is used for

Electrometallurgy is used for

Iron is manufactured from the ore

How is limestone used in Fe extraction

Pb and Sn are extracted from their chief ore by

In froth floatation process for the purification of ores, the particles of ore float because