1.

Which of the following substances has the greatest ionic character ?

Answer»

`Cl_(2)O`
`NCl_(3)`
`PbCl_(2)`
`BaCl_(2)`

Solution :According to Fajan.s rule :
Covalent character `prop (1)/("size or cation" prop "sizer of anion")`
Among the given species order of sizer of cations
`N^(3+),O^(2+) lt PB^(2+), lt Ba^(2+)`
Order of size of ANIONS `O^(2) gt Cl^(-)`
Hence the order of covalent character is
`NCl_(3) gt Cl_(2) O gt PbCl_(2) gt BaCl_(2)`
`Bcl_(2)` is m ost ionicin nature


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