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1
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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.
2
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Match List-I with List-II

List - I List - II
(A) Concentration of gold ore (I) Aniline
(B) Leaching of alumina (II) NaOH
(C) Froth stabiliser (III) SO$$_2$$
(D) Blister copper (IV) NaCN

Choose the correct answer from the options given below :

A
(A) - (IV), (B) - (III), (C) - (II), (D) - (I)
B
(A) - (IV), (B) - (II), (C) - (I), (D) - (III)
C
(A) - (III), (B) - (II), (C) - (I), (D) - (IV)
D
(A) - (II), (B) - (IV), (C) - (III), (D) - (I)
3
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of the following is structure of a separating funnel?

A
JEE Main 2022 (Online) 27th June Morning Shift Chemistry - Isolation of Elements Question 39 English Option 1
B
JEE Main 2022 (Online) 27th June Morning Shift Chemistry - Isolation of Elements Question 39 English Option 2
C
JEE Main 2022 (Online) 27th June Morning Shift Chemistry - Isolation of Elements Question 39 English Option 3
D
JEE Main 2022 (Online) 27th June Morning Shift Chemistry - Isolation of Elements Question 39 English Option 4
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The role of depressants in 'Froth Flotation method' is to

A
selectively prevent one component of the ore from coming to the froth.
B
reduce the consumption of oil for froth formation.
C
stabilize the froth.
D
enhance non-wettability of the mineral particles.
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