1
JEE Main 2022 (Online) 25th June Morning Shift
Numerical
+4
-1

The standard entropy change for the reaction

4Fe(s) + 3O2(g) $$\to$$ 2Fe2O3(s) is $$-$$550 J K$$-$$1 at 298 K.

[Given : The standard enthalpy change for the reaction is $$-$$165 kJ mol$$-$$1]. The temperature in K at which the reaction attains equilibrium is _____________. (Nearest Integer)

2
JEE Main 2021 (Online) 1st September Evening Shift
Numerical
+4
-1
For the reaction, 2NO2(g) $$\rightleftharpoons$$ N2O4(g), when $$\Delta$$S = $$-$$176.0 JK$$-$$1 and $$\Delta$$H = $$-$$57.8 kJ mol$$-$$1, the magnitude of $$\Delta$$G at 298 K for the reaction is ___________ kJ mol$$-$$1. (Nearest integer)
3
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
Two flasks I and II shown below are connected by a valve of negligible volume.

When the valve is opened, the final pressure of the system in bar is x $$\times$$ 10$$-$$2. The value of x is __________. (Integer answer)

[Assume - Ideal gas; 1 bar = 105 Pa; Molar mass of N2 = 28.0 g mol$$-$$1; R = 8.31 J mol$$-$$1 K$$-$$1]
4
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
Data given for the following reaction is as follows :

FeO(s) + C(graphite) $$\to$$ Fe(s) + CO(g)

Substance $$\Delta H^\circ$$
(kJ mol$$^{ - 1}$$)
$$\Delta S^\circ$$
(J mol$$^{ - 1}$$ K$$^{ - 1}$$)
$$Fe{O_{(s)}}$$ $$- 266.3$$ 57.49
$${C_{(graphite)}}$$ 0 5.74
$$F{e_{(s)}}$$ 0 27.28
$$C{O_{(g)}}$$ $$- 110.5$$ 197.6

The minimum temperature in K at which the reaction becomes spontaneous is ___________. (Integer answer)