1
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
Change Language
__________ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) (C3H4O) if the percentage yield is 64. (Round off to the Nearest Integer).

[Given : Atomic masses : C : 12.0 u, H : 1.0 u, O : 16.0 u ]
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2
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
Change Language
A reaction of 0.1 mole of Benzylamine with bromomethane gave 23 g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n $$\times$$ 10$$-$$1, when n = __________. (Round off to the Nearest Integer).

(Given : Atomic masses : C : 12.0 u, H : 1.0 u, N : 14.0 u, Br : 80.0 u]
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3
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
Change Language
The total number of unpaired electrons present in the complex K3[Cr(oxalate)3] is _____________.
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4
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
Change Language
2 molal solution of a weak acid HA has a freezing point of 3.885$$^\circ$$C. The degree of dissociation of this acid is ___________ $$\times$$ 10$$-$$3. (Round off to the Nearest Integer).

[Given : Molal depression constant of water = 1.85 K kg mol$$-$$1 Freezing point of pure water = 0$$^\circ$$ C]
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