JEE Main
Chemistry
Isolation of Elements
Previous Years Questions

Among following compounds, the number of those present in copper matte is ___________. A. $$\mathrm{CuCO_{3}}$$ B. $$\mathrm{Cu_{2}S}$$ C. $$\mathrm{C... The number of statement/s, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the followi... Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number ... Blister copper is produced by reaction of copper oxide with copper sulphide. 2Cu2O + Cu2S$$\to$$6Cu + SO2 When 2.86$$\times$$103 g of Cu2O and 4.7... (a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based? In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ______________Pb, Sb,... ## MCQ (Single Correct Answer) Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In an Ellingham diagram, the oxidati... Which one of the following statements is incorrect? The methods NOT involved in concentration of ore are A. Liquation B. Leaching C. Electrolysis D. Hydraulic washing E. Froth floatation Choose the corr... Match items of column I and II .tg {border-collapse:collapse;border-spacing:0;width: 100%} .tg td{border-color:black;border-style:solid;border-width... Given below are two statements: Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is use... In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to: Given below are two statements : Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon form... The major component of which of the following ore is sulphide based mineral? The reaction representing the Mond process for metal refining is _________. Given below are two statements : Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it. Statement II... Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... Which one of the following reactions does not occur during extraction of copper? The metal which is extracted by oxidation and subsequent reduction from its ore is : Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... In metallurgy the term "gangue" is used for : Which of the reaction is suitable for concentrating ore by leaching process ? Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f... Which of the following methods are not used to refine any metal? A. Liquation B. Calcination C. Electrolysis D. Leaching E. Distillation Choose the co... The metal that is not extracted from its sulfide ore is Given below are two statements. Statement I : Pig iron is obtained by heating cast iron with scrap iron. Statement II : Pig iron has a relatively lowe... The compound(s) that is (are) removed as slag during the extraction of copper is : (A) CaO (B) FeO (C) Al2O3 (D) ZnO (E) NiO Choose the correct answer... Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil... In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved? In the metallurgical extraction of copper, following reaction is used : FeO + SiO2$$\to$$FeSiO3 FeO and FeSiO3 respectively are.... Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A : Magnesium can reduce Al2O3 at a temperature b... Statement I : Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III). Statement II : Zinc is oxidized during the d... Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... Which of the following is structure of a separating funnel? The role of depressants in 'Froth Flotation method' is to Given below are two statements : Statement I : According to Ellingham diagram, any metal oxide with higher$$\Delta$$G$$^\circ$$is more stable than t... Given below are two statements. Statement I : During electrolytic refining, blister copper deposits precious metals. Statement II : In the process of ... Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold an... Which of the following chemical reactions represents Hall-Heroult Process? Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-... Calamine and Malachite, respectively, are the ores of : Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Aluminium is extracted from ... Given below are two statements :Statement I : The process of producing syn-gas is called gasification of coal.Statement II : The composition of syn-ga... Match List-I with List-II : List - I(Name of ore/mineral) List - II(Chemical formula) (a) Calmine (i)$$...
Which refining process is generally used in the purification of low melting metals?
Given below are two statements :Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of copper.Statement II : It is p...
Given below are two statements :Statement I : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $$... Which one of the following set of elements can be detected using sodium fusion extract? The addition of silica during the extraction of copper from its sulphide ore :- The statement is incorrect about Ellingham diagram is Match List I with List II : (Both having metallurgical terms) .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style... In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is : Sulphide ion is soft base and its ores are common for metals.(a) Pb (b) Al (c) Ag (d) Mg Consider two chemical reactions (A) and (B) that take place during metallurgical process:(A)$$ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Z...
Given below are two statements. One is labelled as Assertion A nd the other is labelled as Reason R.Assertion A : Sharp glass edge becomes smooth on h...
An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H...
The metal that can be purified economically by fractional distillation method is :
Match List - I with List - II : List - I List - II (a) Mercury (i) Vapour phase refining (b) ...
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
Match List - I with List - II : List - I List - II (a) Haematite (i) $$A{l_2}{O_3}\,.\,x{H_2}O$$ ...
The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates :...
Which of the following reduction reaction CANNOT be carried out with coke?
The process that involves the removal of sulphur from the ores is :
Match List - I with List - II. List - I List - II (a) Sodium Carbonate (i) Deacon (b) Tit...
Match List - I with List - II. List - I List - II (a) Siderite (i) Cu (b) Calamine (i...
Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?
Match List - I with List - II. List - I (Ore) List - II (Element Present) (a) Kernite (i) Tin ...
The major components of German Silver are :
The method used for the purification of Indium is :
Ellingham diagram is a graphical representation of :
Math List - I with List - II. List I (Metal) List II (Ores) (a) Aluminium (i) Siderite (b) ...
The major components in "Gun Metal” are :
Which of the following ore is concentrated using group 1 cyanide salt ?
The element that can be refined by distillation is :
The incorrect statement is :
Among statements (a) - (d), the correct ones are (a) Lime stone is decomposed to CaO during the extraction of iron from its oxides. (b) In the extract...
Cast iron is used for the manufacture of :
'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :
Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are : (a) CaO + SiO2 $$\t... The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is : The purest from of commercial iron is : The correct statement is : The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are : The correct statement is : Match the refining methods (Column I) with metals (Column II). .tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial, sans-serif... The one that is not a carbonate ore is : Assertion: For the extraction of iron, haematite ore is used. Reason: Haematite is a carbonate ore of iron. The ore that contains the metal in the form of fluoride is : The Mond process is used for the With respect to an ore, Ellingham diagram helps to predict the feasibility of its. The pair that does NOT require calcination is - In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of - Match the ores (column A) with the metals (column B) : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-family:Arial, sans-se... The electrolytes usually used in the electroplating of gold and silver, respectively are: The correct statement regarding the given Ellingham diagram is : ... The ore that contains both iron and copper is : In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with : In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO2 gas is passed through the aqueous so... The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : Fe2O3(s) + 3 CO(g)$$\rightleftharpoons$$2 Fe(1) + 3 CO2... Extraction of copper by smelting uses silica as an additive to remove : Sodium extract is heated with concentrated HNO3 before testing for halogens because : Which one of the following ores is best concentrated by froth floatation method? In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false? Which method of purification is represented by the following equation : Ti (s) + 2I2 (g)$$\buildrel {523K} \over \longrightarrow $$TiI4 (g)$$\buil...
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction...
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are
Which one of the following ores is best concentrated by froth – floatation method?
The metal extracted by leaching with a cyanide is
Aluminium is extracted by the electrolysis of
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