Arrange C, N, O and F in the decreasing order of their second ionisation enthalpy.

Arrange F, Cl, Br and I in the decreasing order of their negative electron gain enthalpy.

The decreasing order of second ionisation potential of K, Ca and Ba is:

Some elementS are given. Li, Cs, Be, C, N, O F, l, Ne, Xe. a) Arrange the above elements in the increasing order of ionization enthalpy. b) Arrange the given elements in the decreasing order of negative electron gain enthalpy.

The direction of electron flow in certain gal-vanic cells are given below. (Symbols are not real) BrarrA , ErarrC , DrarrE , ArarrD : Arrange the metals A,B,C,D and E in the decreasing order of their reactivity.

Give justification, The first lonisation enthalpy of carbon is greater than that of boron, whereas the reverse is correct for the second ionisation enthalpy.

Arrange benzene, n-hexane and ethyne in the decreasing order of acidic behaviour. Also give reason for this behaviour.

Arrange the following compounds in decreasing order of their basic character.

Arrange the following molecụles in the decreasing order of oxidation state (+ve to -ve) of nitrogen. 'NO_2, NH_3, HN_3, N O_2^-, N_2 H4'