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JEE Main

Isolation of Elements

Chemistry

Previous Years Questions

MCQ (Single Correct Answer)

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In metallurgy the term "gangue" is used for :
JEE Main 2022 (Online) 29th July Morning Shift
Which of the reaction is suitable for concentrating ore by leaching process ?
JEE Main 2022 (Online) 28th July Morning Shift
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style...
JEE Main 2022 (Online) 27th July Evening Shift
Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by...
JEE Main 2022 (Online) 27th July Evening Shift
Which of the following methods are not used to refine any metal? A. Liquation B. Calcination C. Electrolysis D. Leaching...
JEE Main 2022 (Online) 27th July Morning Shift
The metal that is not extracted from its sulfide ore is
JEE Main 2022 (Online) 26th July Evening Shift
Given below are two statements. Statement I : Pig iron is obtained by heating cast iron with scrap iron. Statement II : ...
JEE Main 2022 (Online) 25th July Evening Shift
The compound(s) that is (are) removed as slag during the extraction of copper is : (A) CaO (B) FeO (C) Al2O3 (D) ZnO (E)...
JEE Main 2022 (Online) 25th July Morning Shift
Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-styl...
JEE Main 2022 (Online) 24th June Morning Shift
Which of the following chemical reactions represents Hall-Heroult Process?
JEE Main 2022 (Online) 24th June Evening Shift
Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :
JEE Main 2022 (Online) 25th June Morning Shift
Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zi...
JEE Main 2022 (Online) 25th June Morning Shift
Given below are two statements. Statement I : During electrolytic refining, blister copper deposits precious metals. Sta...
JEE Main 2022 (Online) 25th June Evening Shift
The role of depressants in 'Froth Flotation method' is to
JEE Main 2022 (Online) 26th June Evening Shift
Given below are two statements : Statement I : According to Ellingham diagram, any metal oxide with higher $$\Delta$$G$$...
JEE Main 2022 (Online) 26th June Morning Shift
Which of the following is structure of a separating funnel?
JEE Main 2022 (Online) 27th June Morning Shift
Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli...
JEE Main 2022 (Online) 27th June Morning Shift
Statement I : Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III). Statement II :...
JEE Main 2022 (Online) 27th June Evening Shift
Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A : Magnesium can r...
JEE Main 2022 (Online) 28th June Morning Shift
In the metallurgical extraction of copper, following reaction is used : FeO + SiO2 $$\to$$ FeSiO3 FeO and FeSiO3 respect...
JEE Main 2022 (Online) 28th June Evening Shift
Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:sol...
JEE Main 2022 (Online) 29th June Evening Shift
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?...
JEE Main 2022 (Online) 29th June Morning Shift
Calamine and Malachite, respectively, are the ores of :
JEE Main 2021 (Online) 1st September Evening Shift
Given below are two statements :Statement I : The process of producing syn-gas is called gasification of coal.Statement ...
JEE Main 2021 (Online) 31st August Morning Shift
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) ...
JEE Main 2021 (Online) 31st August Morning Shift
Match List-I with List-II : List - I(Name of ore/mineral) List - II(Chemical formula) ...
JEE Main 2021 (Online) 27th August Evening Shift
Which refining process is generally used in the purification of low melting metals?
JEE Main 2021 (Online) 27th August Morning Shift
Given below are two statements :Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of...
JEE Main 2021 (Online) 26th August Evening Shift
Given below are two statements :Statement I : The choice of reducing agents for metals extraction can be made by using E...
JEE Main 2021 (Online) 26th August Morning Shift
The addition of silica during the extraction of copper from its sulphide ore :-
JEE Main 2021 (Online) 27th July Evening Shift
Which one of the following set of elements can be detected using sodium fusion extract?
JEE Main 2021 (Online) 27th July Evening Shift
The statement is incorrect about Ellingham diagram is
JEE Main 2021 (Online) 27th July Morning Shift
Match List I with List II : (Both having metallurgical terms) .tg {border-collapse:collapse;border-spacing:0;} .tg td{b...
JEE Main 2021 (Online) 25th July Evening Shift
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :
JEE Main 2021 (Online) 25th July Morning Shift
Sulphide ion is soft base and its ores are common for metals.(a) Pb (b) Al (c) Ag (d) Mg
JEE Main 2021 (Online) 22th July Evening Shift
Consider two chemical reactions (A) and (B) that take place during metallurgical process:(A) $$ZnC{O_{3(s)}}\buildrel \D...
JEE Main 2021 (Online) 20th July Evening Shift
The metal that can be purified economically by fractional distillation method is :
JEE Main 2021 (Online) 20th July Morning Shift
An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4...
JEE Main 2021 (Online) 20th July Morning Shift
Given below are two statements. One is labelled as Assertion A nd the other is labelled as Reason R.Assertion A : Sharp ...
JEE Main 2021 (Online) 20th July Morning Shift
Match List - I with List - II : List - I List - II (a) Mercury (i) Vapour ...
JEE Main 2021 (Online) 18th March Evening Shift
The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
JEE Main 2021 (Online) 18th March Morning Shift
Match List - I with List - II : List - I List - II (a) Haematite (i) $$A{l...
JEE Main 2021 (Online) 17th March Evening Shift
The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates :...
JEE Main 2021 (Online) 17th March Morning Shift
Which of the following reduction reaction CANNOT be carried out with coke?
JEE Main 2021 (Online) 16th March Evening Shift
The process that involves the removal of sulphur from the ores is :
JEE Main 2021 (Online) 16th March Morning Shift
Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?
JEE Main 2021 (Online) 26th February Evening Shift
Match List - I with List - II. List - I List - II (a) Siderite (i) Cu ...
JEE Main 2021 (Online) 26th February Evening Shift
Match List - I with List - II. List - I List - II (a) Sodium Carbonate (i) ...
JEE Main 2021 (Online) 26th February Evening Shift
Match List - I with List - II. List - I (Ore) List - II (Element Present) (a) Kern...
JEE Main 2021 (Online) 26th February Morning Shift
The method used for the purification of Indium is :
JEE Main 2021 (Online) 25th February Evening Shift
The major components of German Silver are :
JEE Main 2021 (Online) 25th February Evening Shift
Ellingham diagram is a graphical representation of :
JEE Main 2021 (Online) 25th February Morning Slot
Math List - I with List - II. List I (Metal) List II (Ores) (a) Aluminium (i) ...
JEE Main 2021 (Online) 24th February Evening Slot
Which of the following ore is concentrated using group 1 cyanide salt ?
JEE Main 2021 (Online) 24th February Morning Slot
The major components in "Gun Metal” are :
JEE Main 2021 (Online) 24th February Morning Slot
The element that can be refined by distillation is :
JEE Main 2020 (Online) 6th September Evening Slot
The incorrect statement is :
JEE Main 2020 (Online) 6th September Morning Slot
Among statements (a) - (d), the correct ones are (a) Lime stone is decomposed to CaO during the extraction of iron from ...
JEE Main 2020 (Online) 4th September Morning Slot
Cast iron is used for the manufacture of :
JEE Main 2020 (Online) 2nd September Evening Slot
'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :
JEE Main 2020 (Online) 9th January Morning Slot
Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron...
JEE Main 2020 (Online) 8th January Evening Slot
The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :
JEE Main 2020 (Online) 7th January Evening Slot
The purest from of commercial iron is :
JEE Main 2020 (Online) 7th January Morning Slot
The correct statement is :
JEE Main 2019 (Online) 12th April Evening Slot
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, r...
JEE Main 2019 (Online) 12th April Morning Slot
The correct statement is :
JEE Main 2019 (Online) 10th April Evening Slot
Match the refining methods (Column I) with metals (Column II). .tg {border-collapse:collapse;border-spacing:0;} .tg td...
JEE Main 2019 (Online) 10th April Morning Slot
Assertion: For the extraction of iron, haematite ore is used. Reason: Haematite is a carbonate ore of iron....
JEE Main 2019 (Online) 9th April Evening Slot
The one that is not a carbonate ore is :
JEE Main 2019 (Online) 9th April Evening Slot
The ore that contains the metal in the form of fluoride is :
JEE Main 2019 (Online) 9th April Morning Slot
The Mond process is used for the
JEE Main 2019 (Online) 8th April Evening Slot
With respect to an ore, Ellingham diagram helps to predict the feasibility of its.
JEE Main 2019 (Online) 8th April Morning Slot
The pair that does NOT require calcination is -
JEE Main 2019 (Online) 12th January Evening Slot
In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of -
JEE Main 2019 (Online) 12th January Morning Slot
Match the ores (column A) with the metals (column B) : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg...
JEE Main 2019 (Online) 11th January Morning Slot
The electrolytes usually used in the electroplating of gold and silver, respectively are:
JEE Main 2019 (Online) 10th January Evening Slot
The correct statement regarding the given Ellingham diagram is : ...
JEE Main 2019 (Online) 9th January Evening Slot
The ore that contains both iron and copper is :
JEE Main 2019 (Online) 9th January Morning Slot
In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :...
JEE Main 2018 (Online) 16th April Morning Slot
In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO2 gas is...
JEE Main 2018 (Online) 15th April Evening Slot
When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH....
JEE Main 2018 (Offline)
The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : Fe2O3(s) + 3 CO(g) $$\right...
JEE Main 2017 (Online) 9th April Morning Slot
Sodium extract is heated with concentrated HNO3 before testing for halogens because :
JEE Main 2016 (Online) 10th April Morning Slot
Extraction of copper by smelting uses silica as an additive to remove :
JEE Main 2016 (Online) 10th April Morning Slot
Which one of the following ores is best concentrated by froth floatation method?
JEE Main 2016 (Offline)
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
JEE Main 2015 (Offline)
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:
JEE Main 2014 (Offline)
Which method of purification is represented by the following equation : Ti (s) + 2I2 (g) $$\buildrel {523K} \over \long...
AIEEE 2012
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sul...
AIEEE 2008
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are
AIEEE 2005
Which one of the following ores is best concentrated by froth – floatation method?
AIEEE 2004
Aluminium is extracted by the electrolysis of
AIEEE 2002
The metal extracted by leaching with a cyanide is
AIEEE 2002

Numerical

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Among the following the number of curves not in accordance with Freundlich adsorption isotherm is ________. (a) (b) (c...
JEE Main 2022 (Online) 28th July Evening Shift
Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, L...
JEE Main 2022 (Online) 27th July Evening Shift
Blister copper is produced by reaction of copper oxide with copper sulphide. 2Cu2O + Cu2S $$\to$$ 6Cu + SO2 When 2.86 $$...
JEE Main 2022 (Online) 30th June Morning Shift
(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?
JEE Main 2022 (Online) 24th June Evening Shift
In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anod...
JEE Main 2021 (Online) 31st August Evening Shift

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