1
JEE Main 2013 (Offline)
+4
-1
A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be :
(R = 8.314 J/mol K) ( l n 7.5 = 2.01)
A
q = – 208 J, w = – 208 J
B
q = – 208 J, w = + 208 J
C
q = + 208 J, w = + 208 J
D
q = + 208 J, w = – 208 J
2
AIEEE 2012
+4
-1
The incorrect expression among the following is :
A
$${{\Delta {G_{system}}} \over {\Delta {S_{total}}}} = - T$$
B
In isothermal process $${w_{reversible}}$$ = $$- nRT\,\ln \,{{{V_f}} \over {{V_i}}}$$
C
In $$K\, = {{\Delta {H^o} - T\Delta {S^o}} \over {RT}}$$
D
$$K\, = \,{e^{ - \Delta {G^o}/RT}}$$
3
AIEEE 2011
+4
-1
The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27oC is :
A
35.8 J mol-1 K−1
B
32.3 J mol-1 K−1
C
42.3 J mol-1 K−1
D
38.3 J mol-1 K−1
4
AIEEE 2010
+4
-1
The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712 kJ mol–1, the average bond enthalpy of N–H bond in NH3 is :
A
–964 kJ mol–1
B
+352 kJ mol–1
C
+ 1056 kJ mol–1
D
–1102 kJ mol–1
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