Which Is Likely To Show Inert Pair Effect?

The pair of elements having approximately equal ionisation potential is

Which is not the correct order for the stated property?

The correct order of ionisation energy of C, N, O, F is

The electron affinity values (in kg mol^–1) of three halogens X, Y and Z are respectively –349, –333 and –325. Then X, Y and Z respectively, are

Which of the following has the highest second ionisation energy?

The electronic configuration of the element with maximum electron affinity is

The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K⁺, Ca²⁺, Mg²⁺, Be²⁺? 

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

The correct order of the size of iodine species is