What fraction of chlorine will be precipitated as $AgCl$ by using $AgNO_3$ from $[CrCl(NH_3)_5]Cl_2$?

Which of the following double salts does not exist?

Given below are two statements :
Statement $I :$ The identification of $Ni^{2+}$ is carried out by dimethyl glyoxime in the presence of $NH_{4}OH$.
Statement $II :$ The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements,choose the correct answer from the options given below:

The molecular formula of potash alum is

$H_2N - CH_2 - CH_2 - NH_2$ acts as a:

Explain the bonding in coordination compounds in terms of Werner's postulates.