1
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A process has $$\Delta$$H = 200 J mol–1 and $$\Delta$$S = 40 JK–1 mol–1. Out of the values given below, choose the minimum temperature above which the process will be spontaneous :
A
4 K
B
20 K
C
5 K
D
12 K
2
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is :

(Specific heat of water liquid and water vapour are 4.2 kJ K$$-$$1 kg$$-$$1 and 2.0 kJ K$$-$$1 kg$$-$$1; heat of liquid fusion and vapourisation of water are 334 kJ$$-$$1 and 2491 kJ kg$$-$$1, respectively). (log 273 = 2.436, log 373 = 2.572, log 383 = 2.583)
A
7.90 kJ kg$$-$$1 K$$-$$1
B
2.64 kJ kg$$-$$1 K$$-$$1
C
8.49 kJ kg$$-$$1 K$$-$$1
D
9.26 kJ kg$$-$$1 K$$-$$1
3
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2 (T1 < T2). The correct graphical depiction of the dependence of work done (w) on the final volume (V) is :
A
B
C
D
4
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
At 320 K, a gas A2 is 20% dissociated to A(g). The standard free energy change at 320 K and 1 atm in J mol-1 is approximately : (R = 8.314 JK-1 mol-1; ln2 = 0.693; ln 3 = 1.098)
A
4763
B
2068
C
1844
D
4281
EXAM MAP
Medical
NEET