1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Thermodynamics Question 129 English Option 1
B
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Thermodynamics Question 129 English Option 2
C
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Thermodynamics Question 129 English Option 3
D
JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Thermodynamics Question 129 English Option 4
3
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For which of the following processes, $$\Delta $$S is negative ?
A
H2(g) $$ \to $$ 2H(g)
B
N2(g, 1 atm) $$ \to $$ N2(g, 5 atm)
C
C(diamond) $$ \to $$ C(graphite)
D
N2(g, 273 K) $$ \to $$ N2(g, 300 K)
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