For an ideal ionic crystal, the simplest formula is \( \mathrm{AX} ...

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For an ideal ionic crystal, the simplest formula is \( \mathrm{AX} \) and the coordination number of cation is 6 .
\( \mathrm{P} \) The value of radius ratio \( \left(r_{\mathrm{A}^{+}}: r_{\mathrm{X}^{-}}\right) \)

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(a) must be greater than 0.732 .
(b) must lie in between 0.732 and 0.414 .
(c) must lie in between 0.414 and 0.225 .
(d) must be less than 0.414 .
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