The order of ionic character among the compounds is:
\[\text{AgCl} < \text{CoCl}_2 < \text{BaCl}_2 < \text{KCl}\]
The reason is that \(\text{Ag}^+\) has a pseudo-inert gas configuration, making \(\text{AgCl}\) less ionic than the other compounds listed.
All the letters of the word "GTWENTY" are written in all possible ways with or without meaning, and these words are arranged as in a dictionary. The serial number of the word "GTWENTY" is: