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
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
$$37.904\,kJ\,mo{l^{ - 1}}$$
3
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
4
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
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