In which of the following ionic radii of...

In which of the following ionic radii of chromium would

`K_(2)CrO_(4)`

`CrO_(2)`

`CrC1_(2)`

`CrF_(2)`

Text Solution

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The correct Answer is:

Oxidation number os Cr in option `a,b,c` and `d` are `+ 6 , + 4, + 3, +3` respectively.
In given options `(a)` has high oxidation number therefore its radii will be blow. Atomic radii decreases with increase in oxidation no.

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In which of the following compounds the radius of chromium ion is smallest?

`K_2CrO_4`

`CrO_2`

`CrF_3`

`CrCl_3`

For which of the following ionic species radius would be maximum?

`C^(4-)`

`N^(3-)`

`O^(2-)`

`Mg^(2+)`

Ionic radii are

Greater than the respective atomic radii of elements in general

Greater than the respective atomic radii of electropositive elements

Greater than the respective atomic radii of electronegative elements

Less than the respective atomic radii of electronegative elements