For exothermic reaction to be spontaneous (=negative) temperature must be -
1. | High | 2. | Zero |
3. | Constant | 4. | Low |
'The free energy change due to a reaction is zero when-
1. The reactants are initially mixed.
2. A catalyst is added
3. The system is at equilibrium
4. The reactants are completely consumed
Work done is maximum in -
1. Isobaric work
2. Isothermal work
3. Isochoric work
4. Adiabatic work
Equilibrium is represented by:
1. H = 0
2. GTotal = 0
3. STotal = 0
4. E = 0
Entropy decreases in which of the following reactions?
1. Boiling of egg
2. Combustion of benzene at 127C
3. Stretching of rubber band
4. Dissolution of sugar in water
For a given reaction, H =35.5 kJ mol-1 and S = 83.6JK-1 mol-1. The reaction is spontaneous at:
(Assume that H and S do not vary with temperature)
1. | T < 425 K | 2. | T > 425 K |
3. | All temperatures | 4. | T > 298 K |
The standard enthalpy of vaporisation vapH for water at 100C is 40.66 kJ mol-1. The
internal energy of vaporisation of water at 100C (in kJ mol-1) is-
(Assume water vapour to behave like an ideal gas)
1. +37.56
2. -43.76
3. +43.76
4. +40.66
The enthalpy and entropy change for the reaction :
Br2 (l) + Cl2 (g) 2BrCl (g)
are 30 kJ mol-1 and 105 J K-1 mol-1 respectively.
The temperature at which the reaction will be in equilibrium is :
1. | 285.7 K | 2. | 273.4 K |
3. | 450.9 K | 4. | 300.1 K |
Which of the following is not a state function?
1. | ΔS | 2. | ΔG |
3. | ΔH | 4. | ΔQ |
The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 liters to 20 liters at 25°C is -
1.
2.
3.
4.