1
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following compound CANNOT act as a Lewis base?
A
SF4
B
NF3
C
ClF3
D
PCl5
2
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements :

Statement I : Potassium permanganate on heating at 573K forms potassium manganate.

Statement II : Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is true but statement II is false
B
Statement I is false but statement II is true
C
Both statement I and statement II are false
D
Both statement I and statement II are true
3
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Mesityl oxide is a common name of :
A
3-Methyl cyclohexane carbaldehyde
B
4-Methyl pent-3-en-2-one
C
2,4-Dimethyl pentan-3-one
D
2-Methyl cyclohexanone
4
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates :

JEE Main 2021 (Online) 17th March Morning Shift Chemistry - Isolation of Elements Question 63 English
A
$$\Delta$$G > 0 and decomposition of the metal oxide
B
$$\Delta$$G < 0 and decomposition of the metal oxide
C
$$\Delta$$G = 0 and reduction of the metal oxide
D
$$\Delta$$G = 0 and melting or boiling point of the metal oxide
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