1
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following reaction/s will not give p-aminoazobenzene?

JEE Main 2021 (Online) 25th February Morning Shift Chemistry - Compounds Containing Nitrogen Question 120 English
A
C only
B
A only
C
A and B
D
B only
2
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which statement is correct?
A
Buna-N is a natural polymer.
B
Synthesis of Buna-S needs nascent oxygen.
C
Buna-S is a synthetic and linear thermosetting polymer.
D
Neoprene is an addition copolymer used in plastic bucket manufacturing.
3
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
Change Language
Using the provided information in the following paper chromatogram :

JEE Main 2021 (Online) 25th February Morning Shift Chemistry - Basics of Organic Chemistry Question 115 English
Fig : Paper chromatography for compounds A and B.

the calculated Rf value of A ________$$\times$$ 10-1.
Your input ____
4
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
Change Language
The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and $$\Delta$$U was found to be $$-$$742.24 kJ mol$$-$$1. The magnitude of $$\Delta$$H298 for the reaction

$$N{H_2}C{H_{(S)}} + {3 \over 2}{O_{2(g)}} \to {N_{2(g)}} + {O_{2(g)}} + {H_2}{O_{(I)}}$$

is _________ kJ. (Rounded off to the nearest integer) [Assume ideal gases and R = 8.314 J mol$$-$$1 K$$-$$1]
Your input ____
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