This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Match List-I with List-II :

List - I
(Name of ore/mineral)
List - II
(Chemical formula)
(a) Calmine (i) $$Zns$$
(b) Malachite (ii) $$FeC{O_3}$$
(c) Siderite (iii) $$ZnC{O_3}$$
(d) Sphalerite (iv) $$CuC{O_3}.Cu{(OH)_2}$$


Choose the most appropriate answer from the options given below :
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
D
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which refining process is generally used in the purification of low melting metals?
A
Chromatographic method
B
Liquation
C
Electrolysis
D
Zone refining
3
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Given below are two statements :

Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of copper.

Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a forth flotation method.

Choose the most appropriate answer from the options given below :
A
Statement I is true but Statement II is false.
B
Both Statement I and Statement II are true.
C
Statement I is false but Statement II is true.
D
Both Statement I and Statement II are false.
4
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Given below are two statements :

Statement I : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $$\Delta$$G vs temperature.

Statement II : The value of $$\Delta$$S increases from left to right in Ellingham diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are true
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are false
D
Statement I is true but Statement II is false
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