1
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
2
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
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
Phosphorus pentachloride dissociates as follows, in a closed reaction vessel
PCl5 (g) $$\leftrightharpoons$$ PCl3 (g) + Cl2 (g)
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be
A
$$\left( {{x \over {x + 1}}} \right)P$$
B
$$\left( {{2x \over {1 - x}}} \right)P$$
C
$$\left( {{x \over {x - 1}}} \right)P$$
D
$$\left( {{x \over {1 - x}}} \right)P$$
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