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1

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)
Match List-I with List-II :

List - I
(Name of ore/mineral)
List - II
(Chemical formula)
(a) Calmine (i) $$Zns$$
(b) Malachite (ii) $$FeC{O_3}$$
(c) Siderite (iii) $$ZnC{O_3}$$
(d) Sphalerite (iv) $$CuC{O_3}.Cu{(OH)_2}$$


Choose the most appropriate answer from the options given below :
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
D
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

Explanation

(Name of ore/mineral)

(a) Calamine - ZnCO3

(b) Malachite - CuCO3 . Cu(OH)2

(c) Siderite - FeCO3

(d) Sphalerite - ZnS

Note : ( Remember all those ores names. Any one of those can be asked in the exam.)

Oxides Ores :

(1) ZnO - Zincite

(2) Fe2O3 - Haematite

(3) Fe3O4 - Magnetite (FeO + Fe2O3 mixture)

(4) Fe2O3 . 3H2O - Limonite

(5) MnO2 - Pyrolusite

(6) Cu2O - Cuprite or Ruby Copper

(7) TiO2 - Rutile

(8) FeCr2O4 - Chromite (FeO + Cr2O3)

(9) FeTiO3 - Illmenite (FeO + TiO2)

(10) Na2B4O7 . 10H2O - Borax or Tincal

(11) U3O8 - Pitch Blende

(12) SnO2 - Tin Stone or Cassiterite

(13) Ca2B6O11 . 5H2O - Colemanite (2 Cao + 3 B2O3)

(14) Al2O3 . 2H2O - Bauxite

(15) Al2O3 . H2O - Diaspore

(16) Al2O3 - Corundum

Sulphides Ores :

(1) ZnS - Zinc Blende or Sphalerite

(2) PbS - Galena

(3) Ag2S - Argentite or Silver Glance

(4) HgS - Cinnabar

(5) Cu2S - Chalcocite or Copper glance

(6) CuFeS2 - Copper pyrites or Chalco pyrites (Cu2S + Fe2S3 mixture)

(7) FeS2 - Iron pyrites or Fool's Gold

(8) 3Ag2S . Sb2S2 - Pyrargyrite or ruby silver

Halides Ores :

(1) NaCl - Rock Salt

(2) KCl - Sylvine

(3) Na3AlF6 - Cryolite [3NaF + AlF6]

(4) CaF2 - Fluorspar

(5) KCl . MgCl2 . 6H2O - Carnalite

(6) AgCl - Horn Silver

Carbonates Ores :

(1) CaCO3 - Limestone

(2) MgCO3 - Magnesite

(3) CaCO3 . MgCO3 - Dolomite

(4) ZnCO3 - Calamine

(5) PbCO3 - Cerrusite

(6) FeCO3 - Siderite

(7) CuCO3 . Cu(OH)2 or Cu2CO3(OH)2 - Malachite or Basic Copper Carbonates

(8) 2 CuCO3 . Cu(OH)2 - Azurite

Sulphates Ores :

(1) CuSO4 . 2H2O - Gypsum

(2) MgSO4 . 7H2O - Epson Salt

(3) Na2SO4 . 10 H2O - Glauber's Salt

(4) PbSO4 - Anglesite

(5) ZnSO4 . 7H2O - White Vitriol

(6) FeSO4 . 7H2O - Green Vitriol

(7) CuSO4 . 5H2O - Blue Vitriol or Chalcanthite

Nitrate Ores :

(1) KNO3 - Indian Saltpetre

(2) NaNO3 - Chile Saltpetre

Arsenides Ores :

(1) NiAs - Kupfernickel

(2) NiAsS - Nickel glance
2

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)
Which refining process is generally used in the purification of low melting metals?
A
Chromatographic method
B
Liquation
C
Electrolysis
D
Zone refining

Explanation

Liquation method is used to purify those impure metals which has lower melting point than the melting point of impurities associated.

$$\therefore$$ This method is used for metal having low melting point.
3

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)
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 possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a forth flotation method.

Choose the most appropriate answer from the options given below :
A
Statement I is true but Statement II is false.
B
Both Statement I and Statement II are true.
C
Statement I is false but Statement II is true.
D
Both Statement I and Statement II are false.

Explanation

sphalerite-ZnS, copper glance - Cu2S two sulphide ores can be separated by adjusting proportions of oil to water or by using 'Depressants'.
4

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)
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 $$\Delta$$G vs temperature.

Statement II : The value of $$\Delta$$S increases from left to right in Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are true
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are false
D
Statement I is true but Statement II is false

Explanation

Given Statement I is true as in a number of processes, one element is used to reduce the oxide of another metal. Any element will reduce the oxide of other metal which lie above it in the Ellingham diagram because the free energy change will become more negative.

Given Statement II is false as the value of $$\Delta$$S is decreases from left to right in Ellingham diagram.

Questions Asked from Isolation of Elements

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
JEE Main 2022 (Online) 24th June Evening Shift [ Memory Based ] (1)
JEE Main 2022 (Online) 24th June Morning Shift [ Memory Based ] (2)
JEE Main 2021 (Online) 1st September Evening Shift (1)
JEE Main 2021 (Online) 31st August Morning Shift (3)
JEE Main 2021 (Online) 27th August Evening Shift (1)
JEE Main 2021 (Online) 27th August Morning Shift (1)
JEE Main 2021 (Online) 26th August Evening Shift (1)
JEE Main 2021 (Online) 26th August Morning Shift (1)
JEE Main 2021 (Online) 27th July Evening Shift (2)
JEE Main 2021 (Online) 27th July Morning Shift (1)
JEE Main 2021 (Online) 25th July Evening Shift (1)
JEE Main 2021 (Online) 25th July Morning Shift (1)
JEE Main 2021 (Online) 22th July Evening Shift (1)
JEE Main 2021 (Online) 20th July Evening Shift (1)
JEE Main 2021 (Online) 20th July Morning Shift (3)
JEE Main 2021 (Online) 18th March Evening Shift (1)
JEE Main 2021 (Online) 18th March Morning Shift (1)
JEE Main 2021 (Online) 17th March Evening Shift (1)
JEE Main 2021 (Online) 17th March Morning Shift (1)
JEE Main 2021 (Online) 16th March Evening Shift (1)
JEE Main 2021 (Online) 16th March Morning Shift (1)
JEE Main 2021 (Online) 26th February Evening Shift (3)
JEE Main 2021 (Online) 26th February Morning Shift (1)
JEE Main 2021 (Online) 25th February Evening Shift (2)
JEE Main 2021 (Online) 25th February Morning Shift (1)
JEE Main 2021 (Online) 24th February Evening Shift (1)
JEE Main 2021 (Online) 24th February Morning Shift (2)
JEE Main 2020 (Online) 6th September Evening Slot (1)
JEE Main 2020 (Online) 6th September Morning Slot (1)
JEE Main 2020 (Online) 4th September Morning Slot (1)
JEE Main 2020 (Online) 2nd September Evening Slot (1)
JEE Main 2020 (Online) 9th January Morning Slot (1)
JEE Main 2020 (Online) 8th January Evening Slot (1)
JEE Main 2020 (Online) 7th January Evening Slot (1)
JEE Main 2020 (Online) 7th January Morning Slot (1)
JEE Main 2019 (Online) 12th April Evening Slot (1)
JEE Main 2019 (Online) 12th April Morning Slot (1)
JEE Main 2019 (Online) 10th April Evening Slot (1)
JEE Main 2019 (Online) 10th April Morning Slot (1)
JEE Main 2019 (Online) 9th April Evening Slot (3)
JEE Main 2019 (Online) 9th April Morning Slot (1)
JEE Main 2019 (Online) 8th April Evening Slot (1)
JEE Main 2019 (Online) 8th April Morning Slot (1)
JEE Main 2019 (Online) 12th January Evening Slot (1)
JEE Main 2019 (Online) 12th January Morning Slot (1)
JEE Main 2019 (Online) 11th January Morning Slot (1)
JEE Main 2019 (Online) 10th January Evening Slot (1)
JEE Main 2019 (Online) 9th January Evening Slot (1)
JEE Main 2019 (Online) 9th January Morning Slot (1)
JEE Main 2018 (Online) 16th April Morning Slot (1)
JEE Main 2018 (Offline) (1)
JEE Main 2018 (Online) 15th April Evening Slot (1)
JEE Main 2017 (Online) 9th April Morning Slot (1)
JEE Main 2016 (Online) 10th April Morning Slot (2)
JEE Main 2016 (Offline) (1)
JEE Main 2015 (Offline) (1)
JEE Main 2014 (Offline) (1)
AIEEE 2012 (1)
AIEEE 2008 (1)
AIEEE 2005 (1)
AIEEE 2004 (1)
AIEEE 2002 (2)

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