Which of the following processes is reversible?
Transfer of heat by radiation
Electrical heating of a nichrome wire
Transfer of heat by conductor
Geothermal compression
(∆H - ∆E) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 JK -1 mol -1)
-2477.57 J mol -1
2477.57 J mol -1
-1238.78 J mol -1
1238.78 J mol -1
A gas occupies 2 liter at STP. It is provided 300 J heat so that its volume becomes 2.5 liter at 1 atm. What will be the change of its internal energy?
-50.65 J
149.65 J
300 J
249.35 J
Standard enthalpy and standard entropy change for the oxidation of NH3 at 298 K, are -382.64 mol -1 and -145.6 J mol -1 respectively. Standard Gibbs energy change for the same reaction at 298 K is
+339.3 kJ mol -1
-439.3 kJ mol -1
-339.3 kJ mol -1
-493.3 kJ mol -1
For the process
H2O(I) ( 1 bar, 273 K) → H2O(g) (1 bar, 373 K)
The correct set of thermodynamic parameters is
∆G = 0,∆S = +ve
∆G = 0, ∆S = -ve
∆G = +ve, ∆S = 0
∆G = -ve, ∆S = +ve
An ideal gas expands in volume from 10-3 m3 to 10-2 m3 at 300 K against a constant pressure of 105 Nm-2.
The work done is
800 kJ
900 kJ
270 kJ
-900 J
What will be the change of entropy ΔrS° at 298 K for the reaction in which urea is formed from NH3 and CO2?2NH3 (g) + CO2 (g) → NH2CONH2(aq) + H2O(l)[Given the standard entropy of NH2CONH2(aq), CO2 (g), NH3 (g) and H2O(l) are 174.0, 213.7, 192.3 and 69.9 J K-1 mol-1 respectively]
200 JK-1 mol-1
-35.44 JK-1 mol-1
-354.4 JK-1 mol-1
425.2 JK-1 mol-1
2 moles of an ideal gas at 27oC are expanded reversibly from 2 L to 20 L. Find entropy change. (R = 2 cal/ mol K)
0
4
9.2
92.0
In conversion of limestone to lime,
CaCO3 (s) → CaO(s) + CO2 (g)
The value of ∆Ho and ∆So are +179.1 kJ mol -1 and 160.2 J/ K respectively at 298 K and 1 bar. Assuming that ∆Ho and ∆So do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is
1008 K
1200 K
845 K
1118 K