Test: Minerals and ores - JEE MCQ
15 Questions MCQ Test - Test: Minerals and ores
Which of the following statement is not correct about Ellingham diagram?
Which of the ore dressing process requires finest size of ore?
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Which among the following is used as flux in the extraction of iron from oxide ores?
is electrolysed using platinum electrodes,
Which of the following is not added during the extraction of silver by cyanide process?
is cryolite and used in the electrolysis of alumina to lower the melting point and increase electrical conductivity.The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
, calcium carbonate is almost completely decomposed to give 
which acts as a flux and combines with 
present as impurity (gangue) in the ore to form calcium silicate (fusible slag)
(acidic flux) Aluminium is extracted from alumina 
by electrolysis of a molten mixture of
is a bad conductor of electricity. Therefore, cryolite 
and fluorspar 
are added to purified alumina which not onlymake alumina a good conductor of electricity but also reduce the melting point of the mixture to around 
.
Consider the following metallurgical processes:
(I) Heating impure metal CO and distilling the resulting volatile carbonyl (b.p. 
) and finally decomposition at 
to get the pure metal
(II) Heating the sulphide ore in air until a part is converted to oxide and then furher heating in the absence of air to let the oxide react with unchanged metal sulphide
(III) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and 
to obtained the metal The processes used for obtaning magnesium, nickel and copper are respectively:
When copper pyrites is roasted in excess of air, a mixture of 
is formed. 
is present as impurity. This can be removed as slag during reduction of 
. The flux added to form slag is
What is the role of limestone during the extraction of iron from haematite ore?
, spongy iron is obtained. In slag zone 
, limestone reacts with impurity (e.g., silica) to form slag. In the combustion and fusion zone 
, all the charge melts and pig iron is obtained which purified further.In the extraction of aluminium by Hall-Heroult process, purified 
is mixed with 
to
(i) lower the melting point of 
.
(ii) increase the conductivity of molten mixture.
(iii) reduce 
into 
.
(iv) acts as catalyst.
In Hall-Heroult process how much carbon anode is burnt away to produce each 
of aluminium?
of 
produced, about 
of carbon anode is burnt away.Which statement is incorrect regarding Hall-Heroult process for metallurgy of aluminium?
1. Use of 
lowers the melting point of 
2. Steel vessel with lining of carbon acts as cathode.
3. Graphite is used as anode.
4. Carbon dioxide gas is generated at cathode.
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