1
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :
A
Fe2O3
B
Cu2O
C
SO2
D
CO

Explanation

2Cu2S  +  3O2   $$ \to $$   2Cu2O  +   2SO2

2Cu2O  +  Cu2S  $$ \to $$  6Cu  +  SO2

It is a example of auto reduction.

First a part of sulphide ore is converted into oxide which then reacts with remaining sulphide to give the metal.
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

The ore that contains both iron and copper is :
A
Copper Pyrites
B
Malachite
C
Dolomite
D
Azurite

Explanation

Copper pyrites : CuFeS2
Malachite : CuCO3 . Cu(OH)2
Azurite : 2CuCO3 . Cu(OH)2
Dolomite : CaCO3 . MgCO3
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The correct statement regarding the given Ellingham diagram is :

A
At 1400oC, Al can be used for the extraction of Zn from ZnO
B
At 500oC, coke can be used for the extraction of Zn from ZnO
C
Coke cannot be used for the extraction of Cu from Cu2O.
D
At 800oC, Cu can be used for the extraction of Zn from ZnO.

Explanation

According to the given diagram A1 can reduce ZnO.

3ZnO + 2Al $$ \to $$ 3Zn + Al2O3
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

The electrolytes usually used in the electroplating of gold and silver, respectively are:
A
[Au(CN)2] and [Ag(CN)2]
B
[Au(CN)2] and [Ag(Cl)2]
C
[Au(OH)4] and [Ag(OH)2]
D
[Au(NH3)2] and [Ag(CN)2]

Explanation

[Au(CN)2] and [Ag(CN)2] both are soluble complexes.

[Au(CN)2] ⇌ Au+ + 2CN-

[Ag(CN)2] ⇌ Ag+ + 2CN-

The concentration of produced Au+ ion and Ag+ ion due to ionisation is very less which ensure slow deposition and this slow deposition will generate uniform layer on the substance to be electroplated.

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