1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
From the following bond energies :
H $$-$$ H bond energy   : 431.37 kJ mol$$-$$1
C $$=$$ C bond energy   : 606.10 kJ mol$$-$$1
C $$-$$ C bond energy   : 336.49 kJ mol$$-$$1
C $$-$$ H bond energy   : 410.50 kJ mol$$-$$1
Enthalpy for the reaction,
AIPMT 2009 Chemistry - Thermodynamics Question 57 English
will be
A
$$-$$ 243.6 kJ mol$$-$$1
B
$$-$$ 120.0 kJ mol$$-$$1
C
553.0 kJ mol$$-$$1
D
1523.6 kJ mol$$-$$1
2
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The values of $$\Delta $$H and $$\Delta $$S for the reaction,

C(graphite) + CO2(g) $$ \to $$  2CO(g)

are 170 kJ and 170 J K$$-$$1, respectively. This reaction will be spontaneous at
A
910 K
B
1110 K
C
510 K
D
710 K
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
For the gas phase reaction,

PCl5(g)  $$\rightleftharpoons$$ PCl3(g) + Cl2(g)

which of the following conditions are correct ?
A
$$\Delta $$H < 0 and $$\Delta $$S < 0
B
$$\Delta $$H > 0 and $$\Delta $$S < 0
C
$$\Delta $$H = 0 and $$\Delta $$S < 0
D
$$\Delta $$H > 0 and $$\Delta $$S > 0
4
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol$$-$$1 respectively. Enthalpy of formation of HCl is
A
$$-$$ 93 kJ mol$$-$$1
B
245 kJ mol$$-$$1
C
93 kJ mol$$-$$1
D
$$-$$ 245 kJ mol$$-$$1
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