NEET Chemistry Chapter Wise Mock Test – General Principles and Processes of Isolation of Metals
An example of halide ore is
Argentite is a mineral of
Important ore of zinc is
The temperature of the slag zone in the metallurgy of iron using blast furnace is
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?
(c) Copper pyrite
Sulphide ores are generally concentrated by
(a) hand picking
(b) froth floatation process
(c) gravity separation
(d) magnetic separation
The substance added in water in froth floatation process is
(a) pine oil
(b) coconut oil
(c) soap powder
(d) None of these
In the metallurgy of aluminium
(a) Al3+ is oxidised to Al(s)
(b) graphite anode is oxidised to carbon monoxide and carbon dioxide
(c) oxidation state of oxygen changes in the reaction at anode
(d) oxidation state of oxygen changes in the overall reaction involved in the process
Complex is formed in the extraction of
Reagent used to extract silver from Ag2S is
(b) NaCN in the presence of O2
Which of the following benefaction processes is used for the mineral, Al2O3.2H20?
(b) Froth floatation
(d) Magnetic separation
Cassiterite is concentrated by
(c) electromagnetic separation
Which one of the following statements is false?
(a) During roasting, moisture is removed from the ore
(b) The ore is free from almost all non-metallic impurities
(c) Calcination of ore is carried out in the absence of any blast of air
(d) The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy
Electrometallurgical process is used to extract
The final step for the extraction of copper from copper pyrite in Bessemer converter involves the reaction
(a) Cu2S + 2Cu2O ——-> 6Cu + SO2
(b) 4Cu2O+ FeS ———> 8Cu+ FeSO4
(c) 2Cu2O + FeS ———>4Cu + Fe + SO2
(d) Cu2S+ 2FeO ———-> 2Cu+ 2Fe+ SO2
Bessemer convertor is used for the preparation of
(b) wrought iron
(c) pig iron
(d) cast iron
The chief impurity present in red bauxite is
Which one of the following ores is concentrated by chemical leaching method?
(b) Copper pyrite
Cyanide process is used in the extraction of
(d) Both (a) and (c)
Chemical reduction is not suitable for converting
(a) zinc oxide into zinc
(b) cupric sulphide into copper
(c) bauxite into aluminium
(d) haematite into iron
What should be the considerations during the extraction of metals by electrochemical method?
(a) Reactivity ot metal obtained
(b) Selectivity of metal obtained
(c) Suitability of electrodes
(d) Both (a) and (c)
In aluminium extraction by the Baeyer’s process, alumina is extracted from bauxite by sodium hydroxide at high temperature and pressures.
Al2O3(S) + 2OH–(aq) ——–> 2Al2O2–(aq) + H2O(l)
Solid impurities such as Fe203 and SiO2 are removed and then Al(OH)4 is reprecipitated.
2Al(OH)–4 ———> Al2O3 • 3H2O(s) + 2OH–(aq)
In the industrial world
(a) carbon dioxide is added to precipitate the alumina
(b) temperature and pressure and dropped and the supersaturated solution seeded
(c) Both (a) and (b) are practised
(d) the water is evaporated
Heating of ore in the presence of air to remove sulphur impurities is called
(d) None of these
Consider the following reaction at 1000°C
Choose the correct statement at 1000°C.
(a) Zinc can be oxidised by carbon monoxide
(b) Zinc oxide can be reduced by graphite
(c) Both statements (a) and (b) are true
(d) Both statements (a) and (b) are false
The autoreduction process is not used in the metallurgy of
Pb and Sn are extracted from their chief ore by
(a) electrolysis and self reduction
(b) self reduction and electrolysis
(c) carbon reduction and self reduction
(d) self reduction and carbon reduction
Which of the following process involves smelting?
General method for the extraction of metal from oxide ore is
(a) reduction by aluminium
(b) reduction by hydrogen
(c) carbon reduction
(d) electrolytic reduction
The substance which is mixed with the ore for the removal of impurities is termed as
In the electrolytic refining of zinc
(a) graphite is at the anode
(b) the impure metfil is at the cathode
(c) the metal ion gets reduced at the anode
(d) acidified zinc sulphate is the electrolyte
Carbon can reduce ferric oxide to iron at a temperature above 983K because
(a) carbon monoxide formed is thermodynamically less stable than ferric oxide
(b) carbon has a higher affinity towards oxygen than iron
(c) free energy change for the formation of carbon dioxide is less negative than that for ferric oxide
(d) iron has a higher affinity towards oxygen than carbon
During smelting an additional substance is added which combines with impurities to form a fusible product which is known as
Cupellation process is used in the metallurgy of
Brine is electrolysed by using inert electrodes. The reaction at anode is
In order to refine blister copper, it is melted in a furnace and is stirred with green logs of wood. The purpose is
(a) to expel dissolved gases in blister copper
(b) to bring the impurities to surface and oxidise them
(c) to increase the carbon content of copper
(d) to reduce the metallic oxide impurities with hydrocarbon gases released from the wood
Mond’s process is used for
Which process of purifications is represented by the following scheme?
(c) Zone refining
(d) van-Arkel process
Native silver metal froms a water soluble complex with a dilute aqueous solution of NaCN in presence of
Electrolytic refining is used to purify which of the following metals?
(a) Cu and Zn
(b) Ge and Si
(c) Zr and Ti
(d) Zn and Hg
In zone refining method, the molten zone
(a) contains impurities
(b) contains purified metal only
(c) contains more impurity than the original metal
(d) moves to either side
Bauxite ore is concentrated by
(a) froth floatation
(b) electromagnetic separation
(c) chemical separation
(d) hydraulic separation
The minimum voltage required to electrolyse alumina in the Hall-Heroult process is
(a) 1.575 V
(b) 1.60 V
(c) 1.312 V
(d) -2.62 V
When copper ore is mixed with silica, in a reverberatory furnace copper matte produced. The copper matte contains
(a) sulphides of copper (II) and iron (II)
(b) sulphides of copper (II) and iron (III)
(c) sulphides of copper (I) and iron (II)
(d) sulphides of copper (I) and iron (III)
Direction(Q.Nos.44-45): More than one of the answers may be correct. Select the correct answers and mark it according to the codes.
(a) 1, 2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct
Identify the reactions that take place during the smelting process of copper extraction.
Which of the following are ores of copper?
Direction (Q.NOs.48-50): Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion .
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true
Assertion: Aluminium metal is used as reducing agent in the extraction of chromium.
Reason: Reduction of aluminium is known as Gold-Schmidt alumino thermic process.
Assertion: Extraction of iron metal from iron oxide ore is carried out by heating with coke.
Reason: The reaction,
is a spontaneous process.
Assertion: Nitriding is a process of heating steel in an atmosphere of nitrogen.
Reason: Steel becomes brittle after nitriding.
Metals are usually not found as nitrates in their ores”.
Out of the following two (A and B) reasons which is/are true for the above observation?
(A) Metal nitrates are highly unstable.
(B) Metal nitrates are highly soluble in water.
(a) A and B are true
(b) A and B are false
(c) A is false but B is true
(d) A is true but B is false
Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smell of burnt sulphur and caused great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is
Which one of the following is a mineral of iron?
In the extraction of copper from its sulphide ore,the metal is finally obtained by the reduction of cuprous oxide with
(a) copper (I) sulphide (Cu2S)
(b) sulphur dioxide (SO2)
(c) iron sulphide (FeS)
(d) carbon monoxide (CO)
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of
In the equation,
Identify the metal, M.
Which of the following pairs of metals is purified by van-Arkel method?
(a) Zr and Ti
(b) Ag and Au
(c) Ni and Fe
(d) Ga and Ni
Which of the following elements is present as the impurity to the maximum extent in the pig iron?
(d) None of these
Pleating mixture of Cu2O and Cu2S will give
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
(a) Fe and Ni
(b) Ag and Au
(c) Pb and Zn
(d) Se and Ag
Which of the following reaction is an example of calcination process?
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