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1
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
English
Hindi

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?

A
Zinc
B
Gold
C
Silver
D
Copper
2
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
English
Hindi

In the metallurgical extraction of copper, following reaction is used :

FeO + SiO2 $$\to$$ FeSiO3

FeO and FeSiO3 respectively are.

A
gangue and flux.
B
flux and slag.
C
slag and flux.
D
gangue and slag.
3
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
English
Hindi

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : Magnesium can reduce Al2O3 at a temperature below 1350$$^\circ$$C, while above 1350$$^\circ$$C, while above 1350$$^\circ$$C aluminium can reduce MgO.

Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

n light of the above statements, choose most appropriate answer from the options given below :

A
Both A and R are correct, and R is correct explanation of A.
B
Both A and R are correct, but R is NOT the correct explanation of A.
C
A is correct R is not correct.
D
A is not correct, R is correct.
4
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
English
Hindi

Statement I : Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III).

Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
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