General Principles and Processes of Isolation of Elements
In froth floatation process, for the purification of ores, the particles of the ore float because:
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In order to obtain 1 tonne of aluminium, 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite is required. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.(i) Write the formulae of cryolite.(ii) Write down the word which correctly completes the following sentence.By dissolving aluminium oxide in cryolite a ____ (conducting/ non conducting) solution is produced.(iii) Why is so much graphic required for the electrolytic process?(iv) Write the equation for the reaction which takes place at cathode.
Sequence the following steps involved generally in the extraction of a metal in pure form from its ore.(a) The metal obtained from its oxide require further purification for end use.(b) The ore should be converted to its oxide form.(c) The ore is beneficial to us if it is handpicked then metal crushed and ground, and later subjected to pulverization as per the requirement(d) The ore in the form of oxide is required to be reduced.(e) Dressed ore is required for it to be concentrated.
How zinc is extracted from its ore?
What is the most common type of electrometallurgical processes to obtain pure metal?
Which of these is obtained by electrolytic reduction of its compound?
Thermite process is used to extract metals
Give an example of a sulphide ore which reduced to metal by heating alone, i.e., by roasting.