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Most Important Selected Qs for JEE AdvancedChemistrySolid State

Match the following Lists.(a edge length, r + radius of cation, r radius of anion) ( array l|l List-I & List-II (P) NaCl type crystal & (1) 3 a =4 ( r _ + + r _ - ) (Q) ZnS type crystal & (2) 3 a=2 (r_ + +r_ - ) (R) CsCl type crystal & (3) 2 a=2 (r_ + +r_ - ) array l (S) A ₃ B type crystal in which anion B forms simple cubic unit cell and cation A occupies all the square planar voids array & (4) a=2 (r_ + +r_ - ) arr

Options

  1. AP 4 ; Q 2 ; R 1 ; S 3
  2. BP 1 ; Q 4 ; R 3 ; S 2
  3. CP 1 ; Q 3 ; R 4 ; S 2
  4. DP 4 ; Q 1 ; R 2 ; S 3

Correct answer

D. P 4 ; Q 1 ; R 2 ; S 3

Step-by-step solution

In NaCl crystal Cl ions form fcc unit cell and Na ⁺ ions occupy all theoctahedral voids. a=2 (r_ + +r_ - ) In ZnS crystal S ²⁻ ions form fcc unit cell and Zn ²⁺ ions occupy alternate tetrahedral voids 3 4 a= (r_ + +r_ - ) In CsCl crystal, Cl ⁻ ions form simple cubic unit cell and Cs ⁺ ions occupy the centre of each cube 3 a=2 (r_ + +r_ - ) In A ₃ ~B crystal, anions B ⁻³ ions form simple cubic unit cell and cations A ⁺ occupy square planar voids. 2 a=2 (r_ + +r_ - )

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