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 2006
MCQ (Single Correct Answer)
+4
-1
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct?
A
(Tf)irrev > (Tf)rev
B
(Tf)rev = (Tf)irrev
C
Tf > Ti for reversible process but Tf = Ti for irreversible process
D
Tf = Ti for both reversible and irreversible processes
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
($$\Delta H - \Delta U$$) for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 J K–1 mol–1)
A
–1238.78 J mol–1
B
1238.78 J mol–1
C
–2477.57 J mol–1
D
2477.57 J mol–1
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
The standard enthalpy of formation $$\Delta _fH^o$$ at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be :
A
the dissociation energy of H2 and enthalpy of sublimation of carbon
B
latent heat of vapourization of methane
C
the first four ionization energies of carbon and electron gain enthalpy of hydrogen
D
the dissociation energy of hydrogen molecule, H2
JEE Main Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12