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JEE Main 2021 (Online) 16th March Evening Shift
Numerical
+4
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In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg pressure. The percentage composition of nitrogen in the compound is __________. (Round off to the Nearest Integer). [Given : Aqueous tension at 287 K = 14 mm of Hg]
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JEE Main 2021 (Online) 25th February Morning Slot
Numerical
+4
-1
Using the provided information in the following paper chromatogram :

JEE Main 2021 (Online) 25th February Morning Slot Chemistry - Practical Organic Chemistry Question 28 English
Fig : Paper chromatography for compounds A and B.

the calculated Rf value of A ________$$\times$$ 10-1.
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3
JEE Main 2021 (Online) 24th February Evening Slot
Numerical
+4
-1
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1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is __________ $$\times$$ 10$$-$$2.
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