JEE Main 2019 (Online) 10th January Evening Slot | Isolation of Elements Question 93 | Chemistry

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JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

The electrolytes usually used in the electroplating of gold and silver, respectively are:

[Au(CN)₂]^– and [Ag(CN)₂]^–

[Au(CN)₂]^– and [Ag(Cl)₂]^–

[Au(OH)₄]^– and [Ag(OH)₂]^–

[Au(NH₃)₂]^– and [Ag(CN)₂]^–

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

The correct statement regarding the given Ellingham diagram is :

JEE Main 2019 (Online) 9th January Evening Slot Chemistry - Isolation of Elements Question 94 English

JEE Main 2019 (Online) 9th January Evening Slot Chemistry - Isolation of Elements Question 94 English

At 1400^oC, Al can be used for the extraction of Zn from ZnO

At 500^oC, coke can be used for the extraction of Zn from ZnO

Coke cannot be used for the extraction of Cu from Cu₂O.

At 800^oC, Cu can be used for the extraction of Zn from ZnO.

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

The ore that contains both iron and copper is :

Copper Pyrites

Malachite

Dolomite

Azurite

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :

Fe₂O₃

Cu₂O

SO₂

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