1
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1
An ideal gas undergoes a cyclic process as shown in Figure.

$$\Delta$$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
2
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
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.
3
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
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.
4
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
For a reaction, A(g) $$\to$$ A($$\ell$$); $$\Delta$$H= $$-$$ 3RT.
The correct statement for the reaction is :
A
$$\Delta$$H = $$\Delta$$U $$\ne$$ O
B
$$\Delta$$H = $$\Delta$$U = O
C
$$\left| {} \right.$$$$\Delta$$H$$\left| {} \right.$$ < $$\left| {} \right.$$$$\Delta$$U$$\left| {} \right.$$
D
$$\left| {} \right.$$$$\Delta$$H$$\left| {} \right.$$ > $$\left| {} \right.$$$$\Delta$$U$$\left| {} \right.$$
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