Take out your scale!
The ionic radius of C r is minimum in which of the following compound?
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1 solution
Which is more ionic,
C
r
O
X
4
X
2
−
or
C
r
O
X
3
?
The extra electronegative oxygen atom in
C
r
O
X
4
X
2
−
reduces the electron density around
C
r
X
+
6
, making it smaller in size.
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I disagree with you. In chromate, there's a coordinate bond between chromium and oxygen (complex ion). Thus electron density is higher than in chromium(VI) oxyde. Shouldn't this fact actually increase the radius of Cr in chromate?
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Alright, but isn't the effective positive charge on chromium greater in C r O X 4 X 2 − ?
Usually such questions are answered by checking the oxidation number of concerned atom. But here in both C r O X 3 and K X 2 C r O X 4 , the oxidation number is + 6 . So I just tested my luck by clicking on K X 2 C r O X 4 . @Akhil Bansal Could you please provide a suitable explanation to answer ?