Which one of the following is smallest in size ?

In which of the following pairs does one elements exist as a solid and the other as a liquid under normal conditions ?

An extra electron is added at the periphery of nitrogen atom in the formation of anion. What will be the ratio of effective nuclear charge of nitrogen atom and nitrogen anion?

Ionisation potential and electron affinity of fluorine are 17.42 and 3.45 eV respectively. What will be the ratio of electronegativity of fluorine on Mulliken scale and Pauling scale?

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

The set representing the correct order of ionic radius is

Which among the following factors is the most important in making fluorine the strongest oxidising agent?

The ionic mobility of alkali metal ions in aqueous solution is maximum for

The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23,24,25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy?

Which of the following electronic configurations would exhibit the lowest ionisation energy ?