MEDIUM
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Which of the following minerals is an ore of aluminum?

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Important Questions on General Principles and Processes of Isolation of Elements (Metallurgy)

EASY
Match items of column-I with the items of column-II and assign the correct code:
 
  Column I   Column II
(a) Cyanide process (i) Ultrapure Ge
(b) Froth floatation process (ii) Dressing of ZnS
(c) Electrolytic reduction (iii) Extraction of Al
(d) Zone refining (iv) Extraction of Au
    (v) Purification of Ni
EASY

Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z.

X,Y and Z respectively are

MEDIUM
The role of NaCN in the separation of PbS and ZnS by froth floatation method is
EASY
Sodium Cyanide is added as a depressant in the froth flotation process when the ore contains a mixture of ZnS and PbS. This is because
EASY
Which one of the following ores is best concentrated by froth flotation method?
MEDIUM
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :
EASY
Sulphide ore on roasting gives a gas X. X reacts with Cl2 in the presence of activated charcoal to give Y. Y is :
EASY
The idea of froth flotation method came from a person X and this method is related to the process Y  of ores. X and Y,  respectivity, are:
EASY
Extraction of gold and silver involves leaching with CN- ion. Silver or gold is later recovered by: