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?

The set representing the correct order of ionic radius is

Ce³⁺, La³⁺, Pm³⁺ and Yb³⁺ have ionic radii in the increasing order as

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?

Identify the correct order of solubility in aqueous medium

Which one of the following is correct order of increase of size ?

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

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?

Which element was named as Eka-silicon in Mendeleev's classification of elements ?

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