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 behaves as Lewis acid and not as Bronsted acid ?
HCl
H2SO4
HSO
SO3
D.
SO3
Lewis acids have a tendency to accept electrons while Bronsted acids have a tendency to donate proton.
(a) HCl → H+ + Cl-
(b) H2SO4 → H+ + HSO
(c) HSO → H+ + SO
(d) SO3 + → SO
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