1
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
The transformation occurring in Duma's method is given below :

$${C_2}{H_7}N + \left( {2x + {y \over 2}} \right)CuO \to xC{O_2} + {y \over 2}{H_2}O + {z \over 2}{N_2} + \left( {2x + {y \over 2}} \right)Cu$$

The value of y is ______________. (Integer answer)
2
JEE Main 2021 (Online) 27th August Morning Shift
Numerical
+4
-1
The number of moles of CuO, that will be utilized in Dumas method for estimation nitrogen in a sample of 57.5 g of N, N-dimethylaminopentane is _____________ $$\times$$ 10$$-$$2. (Nearest integer)
3
JEE Main 2021 (Online) 16th March Evening Shift
Numerical
+4
-1
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]
4
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
Using the provided information in the following paper chromatogram :

Fig : Paper chromatography for compounds A and B.

the calculated Rf value of A ________$$\times$$ 10-1.
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