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1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
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
3
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : SO2(g) is absorbed to a large extent than H2(g) on activated charcoal.

Reason R : SO2(g) has a higher critical temperature than H2(g).

In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct but R is not the correct explanation of A.
B
Both A and R are correct and R is the correct explanation of A.
C
A is not correct but R is correct.
D
A is correct but R is not correct.
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