he following 34. A crystalline solid AB has NaCl type struct radius of B-ion is 250 pm. Which of the follo cation can be made to slip into tetrahedral sit crystals of A+B-? (1) P+ (radius = 180 pm) (2) Q+ = (radius = 56 pm) (3) R+ = (radius = 200 pm) (4) S+ = (radius = 150 pm)

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for teteanedsal woids [ begin{array}{l} a=sqrt{2} R & R=frac{sqrt{2} a}{2}-0 end{array} ] Here, ( R=250 ) pm Now if ( r^{prime} ) be the radins of word to a diagonal of cube [ begin{array}{l} 2(R+r)=sqrt{3} a text { Muiding } 25 mathrm{m} frac{2(R+2)}{R}=frac{sqrt{3} alpha times 2}{sqrt{29}} 1+frac{2}{R}=frac{sqrt{3}}{12} frac{C}{R}=0.225 end{array} ] for feraneacal woid, ( frac{x^{+}}{c^{-}}=0.225 ) ( begin{aligned} text { or we can say } R &=0.225 times 250 &=56.25 mathrm{mm} end{aligned} ) Ans ( =(2) Q^{+}(text {radin }=56 mathrm{m}) )

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