1
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Extraction of copper by smelting uses silica as an additive to remove :
A
Cu2S
B
FeO
C
FeS
D
Cu2O
2
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is
A
Fe
B
Zn
C
Ca
D
Al

Explanation

Among the given Metal Al is the correct answer.



Al2O3 is used as an absorbed in chromatography.
3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO2 gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :
A
NaAlO2   and   Al2(CO3)3.x H2O
B
A(OH)3   and   Al2O3.x H2O
C
Na[Al(OH)4]   and   Al2O3.x H2O
D
Na[Al(OH)4]   and   Al2(CO3)3.x H2O

Explanation

4
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.

Questions Asked from Isolation of Elements

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