Class 12 Chemistry Ch-6 General Principles of Isolation MCQs Exam 2027 
Class 12 Chemistry Ch-6 General Principles of Isolation MCQs Exam 2027 MCQs Exam 2027 Details: नीचे दिए गए सभी Questions Bihar Board परीक्षा 2027 के लिए “Very Very Important Multiple Choice Questions (MCQs) Objective” (अत्यंत महत्वपूर्ण प्रश्न) हैं। इन सभी Class 12th Chemistry /रसायन विज्ञानं ) = रसायन विज्ञानं भाग-1 (English Medium) Book Chapter-6 General Principles of Isolation का Questions का Solve का वीडियो Youtube और Website पर Upload किया है।
General Principles and Processes of Isolation of Elements (100 MCQs)
Topic 1: Ores and Their Types
The mineral from which a metal is extracted is called: [BSEB, 2020 A]
(A) Ore
(B) Gangue
(C) Slag
(D) None of these
Which of the following statements is correct? [BSEB, 2020 A, 2024 A]
(A) All ores are minerals
(B) All minerals are ores
(C) All alkalis are not bases
(D) All of these
The impurity present in the ore is called: [BSEB, 2009 A, 2025 A]
(A) Flux
(B) Gangue
(C) Slag
(D) Alloy
The main ore of Iron is: [BSEB, 2019 A]
(A) Magnetite
(B) Siderite
(C) Haematite
(D) All of these
An important ore of Iron is: [BSEB, 2021 A]
(A) Siderite
(B) Haematite
(C) Pyrite
(D) Bauxite
The main oxide ore of Iron is: [BSEB, 2023 A]
(A) Magnetite
(B) Haematite
(C) Siderite
(D) Bauxite
Which of the following is not an ore of Iron? [BSEB, 2022 A]
(A) Magnetite
(B) Cassiterite
(C) Limonite
(D) Haematite
Magnetite is an ore of: [Exam Year 2010]
(A) $Fe$
(B) $Mg$
(C) $Cu$
(D) $Al$
The main ore of Copper is: [BSEB, 2019 C]
(A) Copper Pyrite
(B) Copper Glance
(C) Galena
(D) Siderite
The formula of Copper Pyrite is: [BSEB, 2010 A, 2015 A, 2017 C, 2021 A]
(A) $CuFeS$
(B) $CuFeS_{2}$
(C) $Cu_{2}S$
(D) $Cu_{2}FeS_{2}$
Malachite is an ore of: [BSEB, 2015 A, 2019 C]
(A) Iron
(B) Copper
(C) Silver
(D) Zinc
The formula of Malachite ore is: [BSEB, 2021 A]
(A) $CuFeS_{2}$
(B) $CuCO_{3} \cdot Cu(OH)_{2}$
(C) $Cu_{2}S$
(D) $Cu_{2}O$
The composition of Malachite is: [Exam Year 2020]
(A) $CuCO_{3} \cdot Cu(OH)_{2}$
(B) $CuFeS_{2}$
(C) $Cu_{2}O$
(D) $Cu_{2}S$
The ore of Aluminium is: [BSEB, 2015 A, 2016 C, 2019 C]
(A) Bauxite
(B) Haematite
(C) Dolomite
(D) None of these
Which of the following is NOT an ore of Zinc? [BSEB, 2020 A, 2021 A]
(A) Zinc Blende
(B) Calamine
(C) Zincite
(D) Bauxite
Calamine is an ore of: [BSEB, 2021 A]
(A) $Zn$
(B) $Fe$
(C) $Al$
(D) $Cu$
The formula of Calamine is: [Exam Year 2023]
(A) $ZnCO_{3}$
(B) $ZnO$
(C) $ZnS$
(D) $ZnSO_{4}$
Cinnabar is: [BSEB, 2016 A]
(A) $HgS$
(B) $PbS$
(C) $ZnS$
(D) $H_{2}S$
Galena is an ore of: [BSEB, 2021 A]
(A) $Sn$
(B) $Pb$
(C) $Si$
(D) $Ag$
Cassiterite is an ore of: [Exam Year 2018]
(A) $Mn$
(B) $Ni$
(C) $Sb$
(D) $Sn$
Pyrolusite is an ore of which of the following? [BSEB, 2023 A]
(A) Manganese
(B) Magnesium
(C) Zinc
(D) Iron
Pyrolusite is a/an: [BSEB, 2023 A]
(A) Oxide ore
(B) Sulphide ore
(C) Carbonate ore
(D) Chloride ore
Which mineral contains Magnesium ($Mg$)? [Exam Year 2017]
(A) Dolomite
(B) Bauxite
(C) Calamine
(D) Pyrolusite
Silver-containing ore is: [Exam Year 2019]
(A) Silver Glance
(B) Dolomite
(C) Limonite
(D) Magnetite
Silver Glance is an ore of: [Exam Year 2019]
(A) $Ag$
(B) $Au$
(C) $Cu$
(D) $Pb$
The main constituent of bones is: [Exam Year 2016]
(A) $CaCO_{3}$
(B) $Ca_{3}(PO_{4})_{2}$
(C) $CaSO_{4}$
(D) $CaF_{2}$
The element found in seawater is: [BSEB, 2016 A]
(A) Magnesium
(B) Sodium
(C) Iodine
(D) All of these
Which of the following metals is found in abundance in the Earth’s crust? [BSEB, 2012 A, 2015 A, 2022 A]
(A) $Mg$
(B) $Na$
(C) $Al$
(D) $Fe$
Which of the following metals is generally found in a free state? [BSEB, 2024 A]
(A) $Cu$
(B) $Au$
(C) $Fe$
(D) $Mg$
Which of the following metals is found in a native/free state in nature? [Exam Year 2012]
(A) Sodium
(B) Iron
(C) Zinc
(D) Platinum
An ore that contains two different metals is: [BSEB, 2024 A]
(A) Iron ore
(B) Lead ore
(C) Silver ore
(D) Copper Pyrite
Which of the following is a carbonate ore? [BSEB, 2020 A, 2024 A]
(A) Pyrolusite
(B) Malachite
(C) Diaspore
(D) Cassiterite
The salt which is least common in minerals is: [Exam Year 2022]
(A) Chloride
(B) Sulphate
(C) Sulphide
(D) Nitrate
Topic 2: Concentration of Ores
Concentration of sulphide ores is done by: [BSEB, 2015 A, 2017 A, 2021 A, 2022 A]
(A) Froth-floatation process
(B) Electrolysis
(C) Roasting
(D) None of these
The concentration of Zinc Blende ore is done by: [BSEB, 2017 C]
(A) Gravity separation
(B) Magnetic separation
(C) Froth-floatation process
(D) None of these
Concentration of Copper Pyrite is done by: [BSEB, 2015 A]
(A) Froth-floatation process
(B) Magnetic separation
(C) Gravity separation
(D) None of these
By Leaching, we do ______ of the ore: [Exam Year 2021]
(A) Oxidation
(B) Concentration
(C) Reduction
(D) Roasting
The extraction of which metal involves leaching the ore with dilute cyanide solution? [Exam Year 2023]
(A) Silver
(B) Titanium
(C) Vanadium
(D) Zinc
The main impurity present in Bauxite is: [Exam Year 2013]
(A) $Fe_{2}O_{3}$
(B) $SiO_{2}$
(C) Both (A) and (B)
(D) $P_{2}O_{5}$
Topic 3: Roasting, Calcination & Smelting
Heating the ore in the absence of air to remove volatile impurities is called: [BSEB, 2019 A]
(A) Calcination
(B) Roasting
(C) Smelting
(D) Refining
Calcination is used for: [Exam Year 2015]
(A) Carbonate ores
(B) Sulphide ores
(C) Chloride ores
(D) None of these
Roasting is used for: [Exam Year 2016]
(A) Sulphide ores
(B) Oxide ores
(C) Carbonate ores
(D) None of these
Roasting of sulphide ores is generally done to: [Exam Year 2018]
(A) Convert into oxides
(B) Remove impurities
(C) Obtain the metal
(D) Both (A) and (B)
Removal of Sulphur by heating Pyrite is called: [Exam Year 2015]
(A) Smelting
(B) Calcination
(C) Liquation
(D) Roasting
The main function of Roasting is: [Exam Year 2020]
(A) To oxidize the metal
(B) To remove impurities like Sulphur as volatile oxides
(C) To form slag
(D) To melt the ore
In Smelting, the reducing agent used for metal oxides is: [BSEB, 2021 A, 2025 A]
(A) $Al$
(B) $C$
(C) $Mg$
(D) $CO$
The process of reducing a metal oxide to metal using Carbon or Carbon Monoxide is called: [BSEB, 2023 A]
(A) Smelting
(B) Roasting
(C) Calcination
(D) Leaching
The liquid material formed inside the furnace during Smelting is called: [Exam Year 2022]
(A) Ore
(B) Gangue
(C) Slag
(D) Flux
Gangue + Flux = ? [Exam Year 2019]
(A) Slag
(B) Ore
(C) Mineral
(D) None of these
The function of ‘Flux’ used in Smelting is: [Exam Year 2019]
(A) To melt the ore
(B) To react with gangue and form slag
(C) To oxidize the metal
(D) None of these
The melting point of Slag is: [Exam Year 2021]
(A) Lower than the metal
(B) Higher than the metal
(C) Equal to the ore
(D) None of these
The metal extracted by Carbon reduction method is: [Exam Year 2017]
(A) $Fe$
(B) $Al$
(C) $Na$
(D) $Mg$
Topic 4: Extraction of Specific Metals
In Blast furnace, which oxide is reduced? [BSEB, 2020 A]
(A) Iron oxide
(B) Copper oxide
(C) Sodium oxide
(D) Zinc oxide
Which main furnace is used in the extraction of Iron? [Exam Year 2017]
(A) Blast Furnace
(B) Muffle Furnace
(C) Electric Furnace
(D) None of these
In the extraction of Iron from Haematite, limestone is used as: [BSEB, 2021 A]
(A) Flux
(B) Slag
(C) Reducing agent
(D) Oxidizing agent
In Blast furnace, Limestone ($CaCO_{3}$) acts as: [Exam Year 2015]
(A) Flux
(B) Slag
(C) Ore
(D) Reducing agent
Hall-Heroult process is used in the extraction of: [BSEB, 2020 A]
(A) $Fe$
(B) $Al$
(C) $Cu$
(D) $Zn$
Aluminium is extracted from which ore? [BSEB, 2013 A]
(A) Haematite
(B) Bauxite
(C) Cassiterite
(D) None of these
Bauxite is purified by which process? [BSEB, 2015 A]
(A) Bayer’s Process
(B) Cyanide Process
(C) Froth-floatation Process
(D) None of these
In aluminothermic process, Aluminium acts as: [Exam Year 2014]
(A) Oxidizing agent
(B) Reducing agent
(C) Flux
(D) Catalyst
Which of the following is extracted by aluminothermic process? [Exam Year 2018]
(A) $Au$
(B) $Pb$
(C) $Fe$
(D) $Cr$
In thermite process, the reducing agent is: [Exam Year 2016]
(A) C
(B) Zn
(C) Na
(D) Al
The chemical composition of slag formed during the extraction of Copper is: [BSEB, 2024 A]
(A) $CuFeS_{2}$
(B) $FeSiO_{3}$
(C) $Cu_{2}S$
(D) $CuSiO_{3}$
Copper Matte mainly consists of: [Exam Year 2024]
(A) $Cu_{2}S$ and $FeS$
(B) $Cu_{2}S$ and $Cu_{2}O$
(C) $FeS$ and $SiO_{2}$
(D) $Cu_{2}S$ and $FeO$
In the extraction of Copper from sulphide ore, the final reduction of Copper is done by: [BSEB, 2018 A]
(A) $FeS$
(B) $CO$
(C) $Cu_{2}S$
(D) $SO_{2}$
Blister Copper is obtained due to: [Exam Year 2015]
(A) Impurities
(B) Escape of $SO_{2}$ gas
(C) $N_{2}$ gas
(D) None of these
Zinc is extracted from Zinc Blende ($ZnS$) by which method? [BSEB, 2017 A]
(A) Electrolytic reduction
(B) Carbon reduction method
(C) Self-reduction
(D) None of these
Roasting of Zinc Blende gives: [Exam Year 2014]
(A) $Zn$
(B) $ZnO$
(C) $ZnSO_{4}$
(D) $ZnCO_{3}$
‘Mac-Arthur Forrest’ process is used for the extraction of: [BSEB, 2018 A]
(A) $Ag$ (Silver)
(B) $Fe$ (Iron)
(C) $Cu$ (Copper)
(D) $Na$ (Sodium)
Which of the following metals is extracted by Cyanide process? [BSEB, 2023 A]
(A) $Cr$
(B) $Ag$
(C) $Cu$
(D) $Zn$
Which compound is used in solution for extracting Silver from its ore? [Exam Year 2021]
(A) $NaCN$
(B) $NaCl$
(C) $AgNO_{3}$
(D) $Na_{2}SO_{4}$
Gold ($Au$) is extracted by which process? [Exam Year 2018]
(A) Cyanide process
(B) Froth-floatation
(C) Roasting
(D) None of these
Metal extracted by Cyanide process is: [Exam Year 2023]
(A) $Ag$
(B) $Cu$
(C) $Fe$
(D) $Zn$
Which metal is obtained by roasting Cinnabar ($HgS$)? [Exam Year 2019]
(A) $S$
(B) $Hg$
(C) $Pb$
(D) $Zn$
Self-reduction process is NOT used in the metallurgy of: [Exam Year 2022]
(A) $Hg$
(B) $Cu$
(C) $Pb$
(D) $Fe$
Electrometallurgy is used for the extraction of: [BSEB, 2024 A]
(A) $Cu$
(B) $Au$
(C) $Al$
(D) $Fe$
Which of the following metals is NOT extracted by electrolysis of its fused salt? [BSEB, 2022 A]
(A) $Na$
(B) $Mg$
(C) $Al$
(D) $Fe$
Obtaining highly electropositive metals by electrolysis of their fused salts is called: [Exam Year 2020]
(A) Electrorefining
(B) Electrometallurgy
(C) Leaching
(D) None of these
Electrolytic reduction process is not adopted for the extraction of: [Exam Year 2021]
(A) $Mg$
(B) $Al$
(C) $Ca$
(D) $Fe$
Which metal cannot be obtained by electrolysis of its salt solution? [Exam Year 2023]
(A) $Ag$
(B) $Al$
(C) $Cu$
(D) $Na$
Extraction of which metal cannot be done by ‘Solvay Process’? [Exam Year 2017]
(A) $Na$
(B) $K$
(C) $Ca$
(D) $Mg$
Topic 5: Refining of Metals
Germanium for use as a semiconductor is purified by: [BSEB, 2017 A]
(A) Zone Refining
(B) Cupellation
(C) Poling
(D) Leaching
Which metal is purified by Zone Refining? [Exam Year 2020]
(A) $Si$
(B) $Ge$
(C) $Ga$
(D) All of these
Ultra-pure Boron and Silicon are obtained by: [Exam Year 2018]
(A) Zone Refining
(B) Van-Arkel Method
(C) Mond’s Process
(D) Liquation
Mond’s Process is used for the refining of: [BSEB, 2022 A]
(A) $Cu$
(B) $Fe$
(C) $Ni$
(D) $Al$
The metal purification method expressed by the following equation is called: [BSEB, 2025 A]
$Ti + 2I_{2} \to TiI_{4} \to Ti + 2I_{2}$
(A) Cupellation
(B) Poling
(C) Van-Arkel
(D) Zone Refining
Refining of Copper metal is done by which method? [BSEB, 2019 A]
(A) Electrolytic refining
(B) Zone Refining
(C) Chromatography
(D) None of these
Which metal is purified by Hoope’s process? [BSEB, 2022 A]
(A) $Cu$
(B) $Al$
(C) $Fe$
(D) $Zn$
In electrolytic refining, the impure metal is made as: [Exam Year 2015]
(A) Anode
(B) Cathode
(C) Electrolyte
(D) None of these
The process of refining an impure metal based on electrolysis is called: [Exam Year 2018]
(A) Electrorefining
(B) Electroreduction
(C) Self-reduction
(D) Liquation
Purification by electrolysis method is done for: [Exam Year 2020]
(A) $Pb$
(B) $C$
(C) $Cu$
(D) $Si$
Which method is used to check the purity of Silver? [Exam Year 2016]
(A) Cupellation
(B) Poling
(C) Distillation
(D) None of these
Topic 6: Miscellaneous
Spelter is: [BSEB, 2016 C]
(A) Pure Zinc
(B) Impure Zinc
(C) Impure Aluminium
(D) Impure Mercury
The chemical formula of Blue Vitriol is: [BSEB, 2016 C]
(A) $CuSO_{4}$
(B) $CuSO_{4} \cdot 5H_{2}O$
(C) $CaSO_{4} \cdot 2H_{2}O$
(D) None of these
$NaOH$ is also known as: [BSEB, 2016 C]
(A) Caustic Soda
(B) Washing Soda
(C) Caustic Potash
(D) All of these
Adding excess $KI$ to Copper Sulphate solution gives a white precipitate of: [BSEB, 2018 A]
(A) $CuI_{2}$
(B) $Cu_{2}I_{2}$
(C) $Cu_{2}SO_{4}$
(D) $I_{2}$
Amalgam is an alloy of: [Exam Year 2016]
(A) Mercury ($Hg$)
(B) Iron ($Fe$)
(C) Copper ($Cu$)
(D) Lead ($Pb$)
Which of the following oxides is basic? [Exam Year 2022]
(A) $Na_{2}O$
(B) $SO_{2}$
(C) $Cl_{2}O_{7}$
(D) $P_{2}O_{5}$
The science of extracting metals is called: [Exam Year 2010]
(A) Metallurgy
(B) Chemistry
(C) Physics
(D) Biology
Aluminium metal is purified by: [Exam Year 2021]
(A) Hoope’s Method
(B) Bayer’s Method
(C) Hall’s Method
(D) None of these
Bihar Board Class 12th के (Chemistry/रसायन विज्ञानं ) = रसायन विज्ञानं ‘भाग-1 (Englsih Medium) Book Chapter-6 General Principles of Isolation के Exam 2027 MCQs Questions Answer Key
| Q. No. | Ans | Q. No. | Ans | Q. No. | Ans | Q. No. | Ans |
| 1 | (A) | 26 | (B) | 51 | (A) | 76 | (C) |
| 2 | (A) | 27 | (D) | 52 | (A) | 77 | (D) |
| 3 | (B) | 28 | (C) | 53 | (A) | 78 | (B) |
| 4 | (C) | 29 | (B) | 54 | (A) | 79 | (D) |
| 5 | (B) | 30 | (D) | 55 | (A) | 80 | (B) |
| 6 | (B) | 31 | (D) | 56 | (A) | 81 | (B) |
| 7 | (B) | 32 | (B) | 57 | (B) | 82 | (A) |
| 8 | (A) | 33 | (D) | 58 | (B) | 83 | (D) |
| 9 | (A) | 34 | (A) | 59 | (A) | 84 | (A) |
| 10 | (B) | 35 | (C) | 60 | (B) | 85 | (C) |
| 11 | (B) | 36 | (A) | 61 | (D) | 86 | (C) |
| 12 | (B) | 37 | (B) | 62 | (D) | 87 | (A) |
| 13 | (A) | 38 | (A) | 63 | (B) | 88 | (B) |
| 14 | (A) | 39 | (C) | 64 | (A) | 89 | (A) |
| 15 | (D) | 40 | (A) | 65 | (C) | 90 | (A) |
| 16 | (A) | 41 | (A) | 66 | (B) | 91 | (C) |
| 17 | (A) | 42 | (A) | 67 | (B) | 92 | (A) |
| 18 | (A) | 43 | (A) | 68 | (B) | 93 | (B) |
| 19 | (B) | 44 | (D) | 69 | (A) | 94 | (B) |
| 20 | (D) | 45 | (B) | 70 | (B) | 95 | (A) |
| 21 | (A) | 46 | (B) | 71 | (A) | 96 | (B) |
| 22 | (A) | 47 | (A) | 72 | (A) | 97 | (A) |
| 23 | (A) | 48 | (C) | 73 | (A) | 98 | (A) |
| 24 | (A) | 49 | (A) | 74 | (B) | 99 | (A) |
| 25 | (A) | 50 | (B) | 75 | (D) | 100 | (A) |
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