NEET Chemistry Chapter Wise Mock Test – General Principles and Processes of Isolation of Metals

NEET Chemistry Chapter Wise Mock Test – General Principles and Processes of Isolation of Metals

Question 1.
An example of halide ore is
(a) bauxite
(b) cryolite
(c) cinnabar
(d) galena

Question 2.
Argentite is a mineral of
(a) gold
(b) silver
(c) copper
(d) platinum

Question 3.
Important ore of zinc is
(a) calamine
(b) cryolite
(c) cassiterite
(d) malachite

Question 4.
The temperature of the slag zone in the metallurgy of iron using blast furnace is
(a) 1500-600°C
(b) 400-700°C
(c) 800-1000°C
(d) 1200-1500°C

Question 5.
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?
(a) Argentite
(b) Galena
(c) Copper pyrite
(d) Sphalerite

Question 6.
Sulphide ores are generally concentrated by
(a) hand picking
(b) froth floatation process
(c) gravity separation
(d) magnetic separation

Question 7.
The substance added in water in froth floatation process is
(a) pine oil
(b) coconut oil
(c) soap powder
(d) None of these

Question 8.
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

Question 9.
Complex is formed in the extraction of
(a) Fe
(b) Cu
(c) Ag
(d) Na

Question 10.
Reagent used to extract silver from Ag₂S is
(a) NaCN
(b) NaCN in the presence of O₂
(c) NaCl
(d) AgNO₃

Question 11.
Which of the following benefaction processes is used for the mineral, Al₂O₃.2H₂0?
(a) Leaching
(b) Froth floatation
(c) Liquation
(d) Magnetic separation

Question 12.
Cassiterite is concentrated by
(a) liquefaction
(b) floatation
(c) electromagnetic separation
(d) levigation

Question 13.
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

Question 14.
Electrometallurgical process is used to extract
(a) Na
(b) Pb
(c) Ag
(d) Fe

Question 15.
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

Question 16.
Bessemer convertor is used for the preparation of
(a) steel
(b) wrought iron
(c) pig iron
(d) cast iron

Question 17.
The chief impurity present in red bauxite is
(a) SiO₂
(b) Fe₂O₃
(c) K₂SO₄
(d) NaF

Question 18.
Which one of the following ores is concentrated by chemical leaching method?
(a) Galena
(b) Copper pyrite
(c) Cinnabar
(d) Argentite

Question 19.
Cyanide process is used in the extraction of
(a) Au
(b) Cu
(c) Ag
(d) Both (a) and (c)

Question 20.
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

Question 21.
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)

Question 22.
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) ——–> 2Al₂O_2^–(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

Question 23.
Heating of ore in the presence of air to remove sulphur impurities is called
(a) calcination
(b) roasting
(c) smelting
(d) None of these

Question 24.
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

Question 25.
The autoreduction process is not used in the metallurgy of
(a) Hg
(b) Cu
(c) Pb
(d) Fe

Question 26.
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

Question 27.
Which of the following process involves smelting?

Question 28.
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

Question 29.
The substance which is mixed with the ore for the removal of impurities is termed as
(a) slag
(b) catalyst
(c) gangue
(d) flux

Question 30.
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

Question 31.
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

Question 32.
During smelting an additional substance is added which combines with impurities to form a fusible product which is known as
(a) mud
(b) slag
(c) flux
(d) gangue

Question 33.
Cupellation process is used in the metallurgy of
(a) copper
(b) silver
(c) iron
(d) aluminium

Question 34.
Brine is electrolysed by using inert electrodes. The reaction at anode is

Question 35.
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

Question 36.
Mond’s process is used for
(a) Ni
(b) Al
(c) Fe
(d) Cu

Question 37.
Which process of purifications is represented by the following scheme?

(a) Cupellation
(b) Poling
(c) Zone refining
(d) van-Arkel process

Question 38.
Native silver metal froms a water soluble complex with a dilute aqueous solution of NaCN in presence of
(a) carbon
(b) nitrogen
(c) oxygen
(d) argon

Question 39.
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

Question 40.
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

Question 41.
Bauxite ore is concentrated by
(a) froth floatation
(b) electromagnetic separation
(c) chemical separation
(d) hydraulic separation

Question 42.
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

Question 43.
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.
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

Question 44.
Identify the reactions that take place during the smelting process of copper extraction.

Question 45.
Which of the following are ores of copper?
1. Malachite
2. Corundum
3. Chalcopyrites
4. Cinnabar

Question 46.

Question 47.

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

Question 48.
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.

Question 49.
Assertion: Extraction of iron metal from iron oxide ore is carried out by heating with coke.
Reason: The reaction,

is a spontaneous process.

Question 50.
Assertion: Nitriding is a process of heating steel in an atmosphere of nitrogen.
Reason: Steel becomes brittle after nitriding.

Question 51.
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

Question 52.
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
(a) SO₂
(b) CO₂
(c) SO₃
(d) H₂S

Question 53.
Which one of the following is a mineral of iron?
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite

Question 54.
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)

Question 55.
Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of

Question 56.
In the equation,

Identify the metal, M.
(a) Copper
(b) Iron
(c) Gold
(d) Zinc

Question 57.
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

Question 58.
Which of the following elements is present as the impurity to the maximum extent in the pig iron?
(a) Carbon
(b) Silicon
(c) Phosphorus
(d) None of these

Question 59.
Pleating mixture of Cu₂O and Cu₂S will give
(a) Cu₂SO₃
(b) CuO+CuS
(c) Cu+SO₃
(d) Cu+SO₂

Question 60.
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

Question 61.
Which of the following reaction is an example of calcination process?

Answers:

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