1
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
Which refining process is generally used in the purification of low melting metals?
A
Chromatographic method
B
Liquation
C
Electrolysis
D
Zone refining
2
JEE Main 2021 (Online) 26th August Evening Shift
+4
-1
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.
3
JEE Main 2021 (Online) 26th August Morning Shift
+4
-1
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
4
JEE Main 2021 (Online) 27th July Evening Shift
+4
-1
Which one of the following set of elements can be detected using sodium fusion extract?
A
Sulfur, Nitrogen, Phosphorous, Halogens
B
Phosphorous, Oxygen, Nitrogen, Halogens
C
Nitrogen, Phosphorous, Carbon, Sulfur
D
Halogens, Nitrogen, Oxygen, Sulfur
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