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
Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?
H2SO4 + H2O → H3O+ + HSO
H2O + H2O → H3O+ + OH-
H2O + NH → NH3 + OH-
H2O + NH3 → NH + OH-
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
Which of the following oxides is amphoteric in character?
SnO2
SiO2
CO2
CaO
A.
SnO2
Among the given options, SnO2 is an amphoteric oxide.
SnO2 + 4HCl → SnCl4 + 2H2O
SnO2 + 2NaOH → Na2SnO3 + H2O