NEET Chemistry General Principles and Processes Of Isolation Of Elements MCQs Set A

Question: Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

• a) Mg
• b) Zn
• c) Cr
• d) Co

Answer: Zn

Question: Which of the following is not correctly matched?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following is not a mineral of aluminium?

• a) Bauxite
• b) Cryolite
• c) China clay
• d) Malachite

Answer: Malachite

Question: Which of the following is acidic flux?

• a) CaO
• b) MgO
• c) SiO₂ 
• d) All of these

Answer:  SiO₂

Question: In the metallurgy of iron, the slag is

• a) FeSiO₃ 
• b) CaCO₃
• c) CaSiO₃
• d) CaO

Answer:  CaSiO₃

Question: Which of the following is commonly used to produce foam in froth floatation process?

• a) Pine oil
• b) Cresol
• c) NaCN
• d) Xanthate

Answer: Pine oil

Question: Serpeck’s method involves the heating of bauxite with

• a) NaOH
• b) Na₂CO₃
• c) N₂+ C  
• d) CaCO₃

Answer:  N₂+ C  

Question: Sulphide ore is converted to oxide form by using the process

• a) Calcination
• b) Roasting
• c) Smelting
• d) Leaching

Answer: Roasting

Question: Which of the following oxides cannot be reduced by auto or self reduction?

• a) HgO
• b) Cu₂O   
• c) PbO
• d) Al₂O₃

Answer:  Al₂O₃

Question: Which of the following is used as reducing agent in Gold schmidt method?

• a) Al
• b) K
• c) C
• d) Mg

Answer: Al

Question: Which of the following is concentrated by magnetic separation method?

• a) Pyrolusite MnO₂ 
• b) Chromite ore FeO.Cr₂O₃
• c) Magnetite Fe₃O₄ 
• d) All of these

Answer: All of these

Question:  Which of the following is used to reduce TiCl₄ to Ti?

• a) C
• b) Al
• c) Mg
• d) H₂

Answer: Mg

Question:  Ellingham diagrams are plots of ΔG_f° Vs T for the formation of

• a) Oxides
• b) Halides
• c) Sulphides
• d) All of these

Answer: All of these

Question:  Which of the following statement is correct w.r.t. the following graph?

• a) Below 1623 K, Mg reduces Al₂O₃
• b) Above 1623 K, Al reduces MgO
• c) Both (1) & (2) are correct
• d) Both (1) & (2) are wrong

Answer: Both (1) & (2) are correct

Question:  In Ellingham diagrams of Δ_f G oxide formation Vs T, which of the following graphs has negative slope?

• a) C → CO 
• b) Fe → Fe₂O₃
• c) Mg → MgO
• d) All of these

Answer:  C → CO 

Question: Which of the following has the lowest percentage of carbon in it?

• a) Pig iron
• b) Cast iron
• c) Wrought iron
• d) Haematite

Answer: Wrought iron

Question: Which of the following is incorrect w.r.t. metallurgy of iron in the blast furnace?

• a) Zone of combustion : C + O₂→CO₂   
• b) Zone of heat absorbtion : CO₂→ C + O₂
• c) Zone of slag formation : CaO + SiO₂→CaSiO₃  
• d) Zone of reduction : Fe₂O₃+ 3C → 3CO + 2Fe

Answer:  Zone of heat absorbtion : CO₂→ C + O₂

Question: Roasting of sulphide ore is generally performed in

• a) Muffle furnace
• b) Bessemer converter
• c) Blast furnace
• d) Reverberatory furnace

Answer: Reverberatory furnace

Question: Zinc is extracted from zinc blende by

• a) Carbon reduction process
• b) Nitrogen reduction process
• c) Oxygen reduction process
• d) All of these

Answer: Carbon reduction process

Question: Which of the following is leached with NaCN?

• a) Ore of Al
• b) Ore of Cu
• c) Ore of Ag
• d) Ore of Zn

Answer: Ore of Ag

Question: Hall Heroult method is used for the extraction of

• a) Ti
• b) Al
• c) Au
• d) Zn

Answer: Al

Question: Poling is used for purification of metals having impurities of

• a) Metal sulphides
• b) Metal carbonates
• c) Metal bicarbonates
• d) Metal oxides

Answer: Metal oxides

Question: Impure zinc, as collected from earthen clay retort, is called

• a) Blister zinc
• b) Pig zinc
• c) Zinc spelter
• d) Cast zinc

Answer: Zinc spelter

Question: The process of converting hydrated alumina into anhydrous alumina is called

• a) Roasting
• b) Calcination
• c) Dressing
• d) Smelting

Answer: Calcination

Question: Extraction of zinc from zinc blende is achieved by

• a) Electrolytic reduction
• b) Roasting followed by reduction with carbon
• c) Roasting followed by reduction with another metal
• d) Roasting followed by self reduction

Answer: Roasting followed by reduction with carbon

Question: Which of the following metal is purified by distillation process?

• a) Zn
• b) Fe
• c) Al
• d) Cu

Answer: Zn

Question: Vapour phase refining can be carried out in case of

• a) Ni
• b) Zr
• c) Ti
• d) All of these

Answer: All of these

Question: Which of the following is not a method of purification of metals?

• a) Liquation
• b) Distillation
• c) Zone refining
• d) Galvanisation

Answer: Galvanisation

Question: Which of the following metal can be extracted by self reduction process?

• a) Pb
• b) Hg
• c) Cu
• d) All of these

Answer: All of these

Question: Which of the following gives metal by electrolytic reduction conveniently and profitably?

• a) PbO
• b) Fe₂O₃
• c) Cr₂O₃ 
• d) Al₂O₃

Answer: Al₂O₃

More Questions........................................

Question: Which of the following metal can be extracted without using reducing agent?

• a) Sn
• b) Pb
• c) Fe
• d) Both (1) & (2)

Answer: Pb

Question: Which of the following metal is extracted by using coke and carbon monoxide as reducing agent?

• a) Na
• b) Cu
• c) Fe
• d) Al

Answer: Fe

Question: Which of the following metal is extracted by the use of cyanide solution?

• a) Pb
• b) Zn
• c) Mn
• d) Ag

Answer: Ag

Question: A substance which reacts with gangue to form fusible material is called

• a) Flux
• b) Catalyst
• c) Ore
• d) Slag

Answer: Flux

Question: Electrolytic reduction method is used for extraction of

• a) Highly electronegative elements
• b) Transition metals
• c) Highly electropositive elements
• d) Metalloids

Answer: Highly electropositive elements

Question: Cyanide process is used for the extraction of

• a) Au
• b) Cu
• c) Zn
• d) Fe

Answer: Au

Question: Which of the following is not a concentration technique?

• a) Levigation
• b) Froth- flotation
• c) Leaching
• d) Calcination

Answer: Calcination

Question: Which of the following metals cannot be extracted by carbon reduction process?

• a) Pb
• b) Al
• c) Hg
• d) Zn

Answer: Al

Question: Which of the following is not a refining process?

• a) Mond’s process
• b) Van-Arkel process
• c) Poling
• d) Leaching

Answer: Leaching

Question: The ores that are concentrated by Froth flotation method are

• a) Carbonate
• b) Sulphides
• c) Oxides
• d) Phosphates

Answer: Sulphides

Question: In blast furnace, iron oxide is reduced by

• a) Silica
• b) CO
• c) H₂S 
• d) Lime stone

Answer: CO

Question: The silver complex formed during cyanide process is

• a) Na₂[Ag(CN)] 
• b) Na[AgCN]
• c) Na₂[Ag(CN)₂] 
• d) Na[Ag(CN)₂]

Answer:  Na[Ag(CN)₂]

Question: Zincite and calamine respectively are

• a) Oxide and carbonate ore of Zn
• b) Carbonate and oxide ore of Zn
• c) Oxide and sulphate ore of Zn
• d) Sulphate and sulphite ore of Zn

Answer: Oxide and carbonate ore of Zn

Question: Which of the following is chalcopyrite?

• a) CuFeS₂
• b) FeS₂
• c) KMgCl₃.6H₂O 
• d) Al₂O₃.2H₂O

Answer:  CuFeS₂

Question: The alloy used in dental filling contains

• a) Ag and Sn
• b) Ag and Sb
• c) Hg, Ag and Sn
• d) Hg, Ag and Sb

Answer: Hg, Ag and Sn

Question:  What will happen, if anode is made of nickel instead of graphite in the extraction of aluminium from AlCl₃ ?

• a) Nickel will be affected by high temperature
• b) Nickel will combine with Cl₂
• c) Nickel is insulator
• d) All of these

Answer:  Nickel will combine with Cl₂

Question: When molten NaCl is electrolysed by using inert electrode, the product obtained at cathode is

• a) Na
• b) Cl₂  
• c) H₂
• d) Na-Hg amalgam

Answer: Na

Question: By which process zinc is extracted from zinc blende?

• a) Electrolytic reduction
• b) Roasting followed by reduction with carbon
• c) Calcination followed by reduction with carbon
• d) Roasting followed by self reduction

Answer: Roasting followed by reduction with carbon

Question:  What is the slag formed from P₂O₅ impurity in metallurgy of iron?

• a) Ca₃(PO₄)₂ 
• b) CaSiO₃ 
• c) Fe₃(PO₄)₂
• d) FeSiO₃

Answer: Ca₃(PO₄)₂ 

Question: Which of the following oxide is thermally least stable?

• a) CaO
• b) Al₂O₃
• c) Fe₂O₃
• d) Ag₂O

Answer: Ag₂O

Question: Thomas slag is

• a) Calcium silicate
• b) Anode mud
• c) FeSiO₃
• d) Calcium phosphate

Answer: Calcium phosphate

Question: Which of the following give respective metal by self reduction?

• a) Galena PbS
• b) HgS
• c) ZnS
• d) Both (1) & (2)

Answer: Both (1) & (2)

Question: Which of the following statement is incorrect?

• a) Al₂O₃ cannot be reduced into Al by Cr₂O₃   
• b) Ca is stronger reducing agent than Mg
• c) At 673 K, CO is poor reducing agent than carbon
• d) All of these

Answer: At 673 K, CO is poor reducing agent than carbon

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

• a) Al₂O₃+ Na₃AIF₆+ CaF₂ 
• b) Al₂O₃+ KF + Na₃AIF₆    
• c) Al₂O₃+ HF + NaAIF₄ 
• d) Al₂O₃+ CaF₂+ NaAIF₄

Answer:  Al₂O₃+ Na₃AIF₆+ CaF₂ 

Question: In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

• a) Iron sulphide (FeS)
• b) Carbon monoxide (CO)
• c) Copper (I) sulphide (Cu₂S)    
• d) Sulphur dioxide (SO₂)

Answer:  Copper (I) sulphide (Cu₂S)    

Question: Identify the alloy containing a non-metal as a constituent in it

• a) Bell metal
• b) Bronze
• c) Invar
• d) Steel

Answer: Steel

Question: Which one of the following is a mineral of iron ?

• a) Pyrolusite
• b) Magnetite
• c) Malachite
• d) Cassiterite

Answer: Magnetite

Question: Which of the following elements is present as the impurity to the maximum extent in the pig iron?

• a) Phosphorus
• b) Manganese
• c) Carbon
• d) Silicon

Answer: Carbon

Question: From gold amalgam, gold may be recovered by

• a) Distillation
• b) Oxidation
• c) Electrolytic refining
• d) Dissolving in HNO₃

Answer: Distillation

Question: Which of the following pairs of metals is purified by Van Arkel method?

• a) Ni and Fe
• b) Ga and In
• c) Zr and Ti
• d) Ag and Au

Answer: Zr and Ti