JEE Advanced 2020 Paper 2 Offline | Isolation of Elements Question 6 | Chemistry

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JEE Advanced 2020 Paper 2 Offline

MCQ (More than One Correct Answer)

-2

Which among the following statement(s) is/are true for the extraction of aluminium from bauxite?

Hydrated Al₂O₃ precipitates, when CO₂ is bubbled through a solution of sodium aluminate.

Addition of Na₃AlF₆ lowers the melting point of alumina.

CO₂ is evolved at the anode during electrolysis.

The cathode is a steel vessel with a lining or carbon.

JEE Advanced 2019 Paper 2 Offline

MCQ (More than One Correct Answer)

-1

The cyanide process of gold extraction involves leaching out gold from its ore with CN^$$-$$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s).

Q is O₂

Z is [Zn(CN)₄]^2$$-$$

T is Zn

R is [Au(CN)₄]^$$-$$

JEE Advanced 2016 Paper 2 Offline

MCQ (More than One Correct Answer)

-2

Extraction of copper from copper pyrite (CuFeS₂) involves

crushing followed by concentration of the ore by froth flotation

removal of iron as slag

self-reduction step to produce ‘blister copper’ following evolution of SO₂

refining of ‘blister copper’ by carbon reduction

JEE Advanced 2015 Paper 1 Offline

MCQ (More than One Correct Answer)

-2

Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is(are)

Impure Cu strip is used as cathode

Acidified aqueous CuSO₄ is used as electrolyte

Pure Cu deposits at cathode

Impurities settle as anode – mud

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