1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Identify the correct statement regarding a spontaneous process :
A
For a spontaneous process in an isolated system, the change in entropy is positive
B
Endothermic processes are never spontaneous
C
Exothermic processes are always spontaneous
D
Lowering of energy in the reaction process is the only criterion for spontaneity
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
In conversion of lime-stone to lime,
CaCO3(s) $$\to$$ CaO(s) + CO2 (g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ∆H° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is :
A
1008 K
B
1200
C
845 K
D
1118 K
3
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Assuming that water vapour is an ideal gas, the internal energy change $$\left( {\Delta U} \right)$$ when $$1$$ mol of water is vapourised at $$1$$ bar pressure and $${100^ \circ }C$$ (Given : molar enthalpy of vapourisation of water at $$1$$ bar and $$373$$ $$K$$ $$ = 41\,kJ\,mo{l^{ - 1}}\,$$
and $$R = 8.3\,J\,mo{l^{ - 1}}\,{K^{ - 1}}$$ )
A
$$41.00\,kJ\,mo{l^{ - 1}}$$
B
$$4.100\,kJ\,mo{l^{ - 1}}$$
C
$$3.7904\,kJ\,mo{l^{ - 1}}$$
D
$$37.904\,kJ\,mo{l^{ - 1}}$$
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
The enthalpy changes for the following processes are listed below :

Cl2(g) = 2Cl(g), 242.3 kJ mol–1
I2(g) = 2I(g), 151.0 kJ mol–1
ICl(g) = I(g) + Cl(g), 211.3 kJ mol–1
I2(s) = I2(g), 62.76 kJ mol–1

Given that the standard states for iodine and chlorine are I2(s) and Cl2(g), the standard enthalpy of formation for ICl(g) is :
A
–14.6 kJ mol–1
B
–16.8 kJ mol–1
C
+16.8 kJ mol–1
D
+244.8 kJ mol–1
JEE Main Subjects
EXAM MAP