1
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1
Change Language

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant to molal depression constant (Kb/Kf) is _________.

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2
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1
Change Language

The cell potential for the given cell at 298 K

Pt| H2 (g, 1 bar) | H+ (aq) || Cu2+ (aq) | Cu(s)

is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of Cu2+ is 10$$-$$x M. The value of x is ___________.

(Given : $$E_{C{u^{2 + }}/Cu}^\Theta $$ = 0.34 V and $${{2.303\,RT} \over F}$$ = 0.06 V)

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3
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1
Change Language

The equation

k = (6.5 $$\times$$ 1012s$$-$$1)e$$-$$26000K/T

is followed for the decomposition of compound A. The activation energy for the reaction is ________ kJ mol$$-$$1. [nearest integer]

(Given : R = 8.314 J K$$-$$1 mol$$-$$1)

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4
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1
Change Language

Spin only magnetic moment of [MnBr6]4$$-$$ is _________ B.M. (round off to the closest integer)

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