In which of the following equilibrium Kc and Kp are not equal?
2NO (g) ⇌ N2 (g) + O2 (g)
SO2 (g) + NO2 (g) ⇌ SO3 (g) + NO (g)
H2 (g) + I2 (g) ⇌ 2 HI (g)
H2 (g) + I2 (g) ⇌ 2 HI (g)
Which one of the following ion has electronic configuration [Ar] 3d6?
(At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28)
Ni3+
Mn
Fe3+
Fe3+
In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10.The pH of buffer solution is
10
7
6
6
Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by
oxidation
cracking
distillation under reduced pressure
distillation under reduced pressure
The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence
BCl3 > BF3 > BBr3
BBr3 > BCl2 > BF3
BBr3 > BF3 > BCl3
BBr3 > BF3 > BCl3
B.
BBr3 > BCl2 > BF3
As the size of halogen atom increases, the acidic strength of boron halides increases. Thus, BF3 is the weakest Lewis acid. This is because of the pπ - pπ back bonding between the fully-filled unutilised 2p orbitals of F and vacant 2p orbitals of boron which makes BF3 less electron deficient. Such back donation is not possible in case of BCl3 or BBr3 due to the larger energy difference between their orbitals. Thus, these are more electron deficient. Since on moving are more electron deficient. Since on moving down the group the energy difference increases, Thus, the tendency to behave as Lewis acid follows the order
BBr3 > BCl3 > BF3
Property of the alkaline earth metals that increases with their atomic number
the solubility of their hydroxides in water
the solubility of their sulphates in water
ionisation energy
ionisation energy
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
CaSO4
BeSO4
BaSO4
BaSO4
For the reaction
the value of the rate of disappearance of N2O5 is given as
6.25 x 10-3 mol L-1s-1 and 6.25 x 10-3 mol L-1 s-1
1.25 x 10-2 mol L-1s-1 and 6.25 x 10-3 mol L-1 s-1
6.25 x 10-3 mol L-1s-1 and 3.125 x 10-3 mol L-1 s-1
6.25 x 10-3 mol L-1s-1 and 3.125 x 10-3 mol L-1 s-1