General Principles And Processes Of Isolation Of Elements NEET Questions are very important for NEET, JEE as well as AIIMS exam. This is because it has many questions based on isolation of elements like hydrogen, chlorine, bromine and iodine from their respective mixtures. It tests your ability to isolate these elements through tests like vaporization, electrolysis and bulb method.
General Principles And Processes Of Isolation Of Elements NEET Questions
These General Principles And Processes Of Isolation Of Elements NEET Questions contains the following topics:
General Principles And Processes Of Isolation Of Elements NEET Questions
1. The oil used as frothing agent in froth floatation process is
A. coconut oil
B. castor oil
C. palmitic oil
D. pine oil
Answer: pine oil
2. Sulphide ore of zinc/copper is concentrated by
A. floatation process
B. electromagnetic process
C. gravity separation
D. distillation
Answer: floatation process
3. Which of the following ores is concentrated by chemical leaching method?
A. Cinnabar
B. Argentite
C. Copper pyrites
D. Galena
Answer: Argentite
4. How do we separate two sulphide ores by froth floatation method?
A. By using excess of pine oil
B. By adjusting proportion of oil to water or using depressant
C. By using some solvent in which one of the sulphides is soluble
D. By using collectors and froth stabilisers like xanthates
Answer: By adjusting proportion of oil to water or using depressant
5. Common impurities present in bauxite are
A. CuO
B. ZnO
C. CaO
D. SiO2
Answer: SiO2
6. An ore of tin containing FeCrO4 is concentrated by
A. gravity separation
B. magnetic separation
C. froth floatation
D. leaching
Answer: magnetic separation
7. Which of the following ores cannot be concentrated by magnetic separation?
A. Haematite
B. Malachite
C. Magnetite
D. Siderite
Answer: Malachite
8. The significance of leaching in the extraction of aluminium is
A. it helps removing the impurities like SiO2, Fe2O3 etc. from the bauxite ore
B. it converts the ore into oxide
C. it reduces melting point of the ore
D. it eliminates water from bauxite
Answer: it helps removing the impurities like SiO2, Fe2O3 etc. from the bauxite ore
9. Which of the following metals is extracted using a silica lined convertor?
A. Mg
B. Al
C. Cu
D. Zn
Answer: Cu
10. Which of the following sulphides when heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?
A. Cu2S
B. FeS
C. HgS
D. ZnS
Answer: HgS
11. Which of the following metals cannot be obtained by reduction of its metal oxide bv aluminium ?
A. Cr
B. Mn
C. Fe
D. Mg
Answer: Mg
12. Heating pyrites to remove sulphur is called
A. smelting
B. calcination
C. liquation
D. roasting
Answer: roasting
13. Impurities of sulphur, silicon and phosphorus can be removed from cast iron by adding
A. carbon which reduces the impurities
B. water which dissolves the impurities
C. limestone which changes impurities into oxides and pass into slag
D. iron oxide which reacts with impurities by forming slag
Answer: limestone which changes impurities into oxides and pass into slag
14. In metallurgical process, aluminium acts as
A. an oxidising agent
B. a reducing agent
C. acidic flux
D. basic flux
Answer: a reducing agent
15. Ellingham diagram represents change of
A. ΔG with temperature
B. ΔH with temperature
C. ΔG with pressure
D. (ΔG – TΔS) with temperature
Answer: ΔG with temperature
16. In electrorefining of copper some gold is produced as:
A. cathode mud
B. anode mud
C. cathode deposit
D. None of these
Answer: anode mud
17. In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to:
A. lower the melting point of bauxite
B. dissolve bauxite and render it a conductor of electricity
C. protect aluminium produced from oxygen
D. minimise the heat loss due to radiation
Answer: dissolve bauxite and render it a conductor of electricity
18. The purest form of iron is:
A. cast iron
B. pig iron
C. wrought iron
D. steel
Answer: wrought iron
19. During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are:
A. Pb and Zn
B. Sn and Ag
C. Fe and Ni
D. Ag and Au
Answer: Ag and Au
20. 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
21. In the equation
4M + 8CN– + H2O + O2 → 4[M(CN)2]– + 4OH–, the metal M is
A. copper
B. iron
C. gold
D. Zinc
Answer: gold
22. Heating ore with carbon in the absence of air is known as:
A. reduction
B. carbon-reduction
C. smelting
D. Roasting
Answer: smelting
23. In the extraction of copper from sulphide ore, the metal is formed by reduction of Cu2O with
A. FeS
B. CO
C. Cu2S
D. SO2
Answer: Cu2S
24. The method of zone refining of metals is based upon the principle of
A. greater solubility of the impurity in molten state than in solid
B. greater mobility of pure metal than impurity
C. higher melting point of impurity than that of pure metal
D. greater noble character of solid metal than that of the impurity
Answer: greater solubility of the impurity in molten state than in solid
25. Classiterite is the ore of which metal?
A. Mn
B. Sb
C. Sn
D. Ni
Answer: Sn
26. The electrolytic reduction technique is used in the extraction of
A. Highly electronegative elements
B. Highly electropostive elements
C. Metalloids
D. Transition metals
Answer: Highly electropostive elements
27. In the commercial electrochemical process for aluminium extraction, electrolyte used is
A. Al(OH)3 is NaOH solution
B. An aqueous solution of Al2 (SO4)3
C. A molten mixture of Al2O3 and Na3AlF6
D. A molten mixture of Al2O3 and Al(OH)3
Answer: A molten mixture of Al2O3 and Na3AlF6
28. Electrolytic reduction of Al2O3 to Al by Hall- Herault process is carried out
A. in presence of NaCl
B. in presence of fluorite
C. in presence of cryolite which forms a melt with lower melting point
D. in presence of cryolite which forms a melt with high melting point
Answer: in presence of cryolite which forms a melt with lower melting point
29. The chemical composition of ‘slag’ formed during the melting process in the extraction of copper is
A. Cu2O + FeS
B. FeSiO3
C. CuFeS2
D. Cu2S + FeO
Answer: FeSiO3
30. Bessemer converter is used in the manufacture of
A. Pig iron
B. Steel
C. Wrought iron
D. Cast iron
Answer: Steel
31. The method of zone refining of metals is based on the principle of
A. greater mobility of the pure metal than that of the impurity
B. higher melting point of the impurity than that of the pure metal
C. greater noble character of the solid metal than that of impurity
D. greater solubility of the impurity in the molten state than in the solid
Answer: greater solubility of the impurity in the molten state than in the solid
32. In the leaching of Ag2S with NaCN, a stream of air is also passed. It is because
A. The reaction between Ag2S and NaCN is reversible.
B. to oxidise Na2S formed in the reaction to Na2SO4
C. to oxidise Ag2S to Ag2O
D. Both (a) and (b)
Answer: Exothermic
33. Purest form of iron is
A. Cast iron
B. Hard Steel
C. Stainless steel
D. Wrought iron
Answer: Wrought iron
34. Concentration of sulphide ore is done by
A. froth flotation process
B. electrolysis
C. roasting
D. None of these
Answer: froth flotation process
35. Malachite is an ore of
A. iron
B. copper
C. zinc
D. Sliver
Answer: copper
36. Formula of copper pyrite is
A. Cu2S
B. CuFeS
C. CuFeS2
D. Cu2Fe2S2
Answer: CuFeS2
37. Ore of aluminium is
A. bauxite
B. hematite
C. dolomite
D. None of these
Answer: bauxite
38. Removal of the unwanted materials like sand, clays, etc. from the ore is known as ………., …….. or ……….
A. concentration, dressing, benefaction
B. separation, refining, gangue
C. magnetic separation, purification, gangue
D. washing, refining, amalgamation
Answer: concentration, dressing, benefaction
39. For which of the following ores froth floatation method is used for concentration?
A. Haematite
B. Zinc blende
C. Magnetite
D. Camallite
Answer: Zinc blende
40. The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as
A. metallurgy
B. leaching
C. froth floatation process
D. gravity separation
Answer: gravity separation