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1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?
A
White phosphorus
B
Yellow phosphorus
C
$$\beta$$-Black phosphorus
D
$$\alpha$$-Black phosphorus
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
A
BCl3
B
BF3
C
BBr3
D
BI3
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In polythionic acid, H2SxO6 (x = 3 to 5) the oxidation state(s) of sulphur is/are :
A
+ 5 only
B
+ 6 only
C
+ 3 and + 5 only
D
0 and + 5 only
4
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is :
A
0
B
2
C
1
D
3
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