1
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y. X and Y respectively are :
A
X = SO2, Y = Cr2O3
B
X = SO3, Y = Cr2(SO4)3
C
X = SO3, Y = Cr2O3
D
X = SO2, Y = Cr2(SO4)3
2
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Given below are two statements :

Statement I : $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct 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 true.
D
Both Statement I and Statement II are false.
3
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct statement about B2H6 is :
A
Its fragment, BH3, behaves as a Lewis base.
B
All B$$-$$H$$-$$B angles are of 120$$^\circ$$.
C
The two B$$-$$H$$-$$B bonds are not of same length.
D
Terminal B$$-$$H bonds have less p-character when compared to bridging bonds.
4
JEE Main 2021 (Online) 24th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :
A
X = Na[Al(OH)4], Y = CO2, Z = Al2O3.xH2O
B
X = Al(OH)3, Y = CO2, Z = Al2O3
C
X = Al(OH)3, Y = SO2, Z = Al2O3.xH2O
D
X = Na[Al(OH)4], Y = SO2, Z = Al2O3
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