MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100
Explain the role of
(i) cryolite in the electrolytic reduction of alumina
Important Questions on General Principles and Processes of Isolation of Elements
EASY
12th West Bengal Board
IMPORTANT
Explain the role of Carbon monoxide in the purification of nickel.
EASY
12th West Bengal Board
IMPORTANT
Describe the underlying principle of each of the following metal refining methods-
(i) Electrolytic refining of metals
EASY
12th West Bengal Board
IMPORTANT
Describe the underlying principle of each of the following metal refining methods-
(ii) Vapour Phase refining of metals
EASY
12th West Bengal Board
IMPORTANT
Describe the role of the following - NaCN in the extraction of silver from a silver ore.
EASY
12th West Bengal Board
IMPORTANT
Describe the role of the following -
(i) Cryolite in the extraction of aluminium from pure alumina
MEDIUM
12th West Bengal Board
IMPORTANT
Account for the following facts :- (i) The reduction of with is thermodynamically feasible, yet it does not occur at room temperature.
HARD
12th West Bengal Board
IMPORTANT
Account for the following facts :- The reduction of a metal oxide is easier if the metal formed is in liquid state.
MEDIUM
12th West Bengal Board
IMPORTANT
Account for the following facts :- Pine oil is used in froth floatation method.
