1
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
$$\Delta $$fGo at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcl mol-1 and +103 kcal mol-1, respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to : ( R = 2 cal K-1 mol-1 )
A
0.1 atm
B
1 atm
C
10 atm
D
100 atm
2
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For which of the following reactions, $$\Delta $$H is equal to $$\Delta $$U?
A
N2(g) + 3H2(g) $$ \to $$ 2NH3(g)
B
2HI(g) $$ \to $$ H2(g) + I2(g)
C
2NO2(g) $$ \to $$ N2O4(g)
D
2SO2(g) + O2(g) $$ \to $$ 2SO3(g)
3
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An ideal gas undergoes a cyclic process as shown in Figure.

JEE Main 2018 (Online) 15th April Morning Slot Chemistry - Thermodynamics Question 131 English
$$\Delta $$UBC = $$-$$5 kJ mol-1, qAB = $$2$$ kJ mol-1, WAB = $$-$$5 kJ mol-1, WCA = 3 kJ mol-1. Heat absorbed by the system during process $$CA$$ is :
A
$$-$$5 kJ mol-1
B
+5 kJ mol-1
C
18 kJ mol-1
D
$$-$$18 kJ mol-1
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An ideal gas undergoes isothermal expansion at constant pressure. During the process :
A
enthalpy increases but entropy decreases.
B
enthalpy remains constant but entropy increases.
C
enthalpy decreases but entropy increases.
D
Both enthalpy and entropy remain constant.
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