1
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)
2
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A :
A
10 J of the work will be done by the gas.
B
6 J of the work will be done by the gas.
C
10 J of the work will be done by the surrounding on gas.
D
6 J of the work will be done by the surrounding on gas.
3
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.
4
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The enthalpy change on freezing of 1 mol of water at 5oC to ice at −5oC is :

(Given $$\Delta $$fusH = 6 kJ mol$$-$$1 at 0oC,
Cp(H2O, $$\ell $$ = 75.3J mol$$-$$1 K$$-$$1)
Cp(H2O s) =36.8 J mol$$-$$1 K$$-$$1)
A
5.44 kJ mol$$-$$1
B
5.81 kJ mol$$-$$1
C
6.56 kJ mol$$-$$1
D
6.00 kJ mol$$-$$1
JEE Main Subjects
EXAM MAP