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A crystalline solid \( \mathrm{AB} \) has \( \mathrm{NaCl} \) type structure with radius of \( \mathrm{B}^{-} \)ion is \( 250 \mathrm{pm} \). Which of the following cation can be made to slip into tetrahedral site of crystals of \( \mathrm{A}^{+} \mathrm{B}^{-} \)?
(1) \( \mathrm{P}^{+} \)(radius \( =180 \mathrm{pm} \) )
(2) \( \mathrm{Q}^{+}=( \)radius \( =56 \mathrm{pm} \) )
(3) \( \mathrm{R}^{+}= \)(radius \( =200 \mathrm{pm} \) )
(4) \( \mathrm{S}^{+}=( \)radius \( =150 \mathrm{pm}) \)
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