Which of the following order is not correct?

Options

A. `CrO lt Cr_(2)O_(3) lt CrO_(3)` (covalent character)
B. ZnO(Philosopher.s wool) `gt` ZnS(Zinc blend) (ionic character)
C. `BeCl_(2) gt MgCl_(2) gt CaCl_(2) gt SrCl_(2) gt BaCl_(2)` (ionic character)
D. `KCl lt AgCl` (covalent character)

Answer

C

Explanation

(i) `Cr^(+2)O, Cr_(2)^(+3)O_(3), Cr^(+6) O_(3)`
`overset(" ") to `
oxidation state of metal `uarr`
polarisation `uarr`
covalent character `uarr`
(ii) `ZnO (O^(-2)), ZnS(S^(-2))`
`overset(" ") to `
anionic size `uarr`, polarisation `uarr`,
ionic character `darr`
(iii) `BeCl_(2) MgCl_(2) CaCl_(2) SrCl_(2) BaCl_(2)`
`overset(" ") to `
(cationic size `uarr`, polarisation `darr`, ionic character `uarr`)
(iv) KCl AgCl
`K^(+) to `inert gas configuration cation
`Ag^(+) to` Pseudo inert gas configuration cation
polarisation power order `to K^(+) lt Ag^(+)`