An ionic compound is expected to have octahedral structure if \( r_{c} / r_{a}\left(r_{c}r_{a}\r...

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An ionic compound is expected to have octahedral structure if \( r_{c} / r_{a}\left(r_{c}r_{a}\right) \) lies in the range of:
(a) \( 0.414 \) to \( 0.732 \)
(b) \( 0.732 \) to \( 0.82 \)
(c) \( 0.225 \) to \( 0.414 \)
(d) \( 0.155 \) to \( 0.225 \)
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