The heats of combustion of carbon monoxide at constant pressure and at constant volume at 27°C will differ from one another by :
27 cal
54 cal
300 cal
600 cal
A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the pKb of NH4OH is 5.0. The pH of the buffer is
10.0
9.0
6.0
8.0
Which of the following is not a equilibrium ?
Ice Water
I2(s) I2(g)
S (l) S (g)
3O2 2O3
D.
3O2 2O3
When a compound or element exists in different phases (states), a physical equilibrium exists between them.
O2 and O3 are the allotropes of oxygen, ie, have different composition, so the equilibrium exist between them is considered as chemical equilibrium.
The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol-1)
1.0 × 101
1.0 × 105
1.0 × 1010
1.0 × 1030