1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

Match the ores (column A) with the metals (column B) :

(Column A) ores (Column B) Metals
(I) Siderite (a) Zinc
(II) Kaolinite (b) Copper
(III) Malachite (c) Iron
(IV) Calamine (d) Aluminium
A
(I)-(c); (II)-(d); (III)-(b); (IV)-(a)
B
(I)-(a); (II)-(b); (III)-(c); (IV)-(d)
C
(I)-(b); (II)-(c); (III)-(d); (IV)-(a)
D
(I)-(c); (II)-(d); (III)-(a); (IV)-(b)

Explanation

Siderite : FeCO3

Kaolinite : Al2(OH)4Si2O5

Malachite : CuCO3 .Cu(OH)2

Calamine : ZnCO3
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Morning Slot

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of -
A
Copper
B
Platinum
C
Carbon
D
Pure aluminium

Explanation

In the Hall-Heroult process the cathode is made of carbon.
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Evening Slot

The pair that does NOT require calcination is -
A
Fe2O3 and CaCO3⋅MgCO3
B
ZnCO3 and CaO
C
ZnO and Fe2O3⋅xH2O
D
ZnO and MgO

Explanation

In calcination, we convert a compound or ore into oxide.

In option (D) you can see there is ZnO and MgO, as they are already in oxide form so no calcination required for then.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 8th April Morning Slot

With respect to an ore, Ellingham diagram helps to predict the feasibility of its.
A
Electrolysis
B
Thermal reducation
C
Vapour phase refining
D
Zone refining

Explanation

Ellingham diagram gives idea that which sustance or metal is suitable for thermal reduction of oxide.

Questions Asked from Isolation of Elements

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