An ionic compound is expected to have tetrahedral structure if \( r_{c} / r_{a} \) : (a) lies in...

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