Imdadul haque Asked a Question
September 17, 2020 12:06 ampts 30 pts
20. NaCl, KCI, NaBr and KBr erystalline in FC lattices. Their anion and cation touch along the edge of unit cell. The dimensions of their unit cells are 562.8 pm, 627.7 pm, 596.2 pm, and 658.6 pm, respectively. From these data, what can you say about the size of the ionic radii (within an error of about 5%)? (a) lonic radii of the cations depend on the nature of the anions (b) lonic radii of the anions depend on the nature of the cations. (c) Both (a) and (b) (d) lonic radii are independent of the counter ions. A solid consisting of only X atoms has a close-packed structure with X-X distance of 160 pm. Assuming it to be a closed-packed structure of hard spheres with radius equal to half of the X-X bond length, the number of atoms in 1 cm would be: . (a) 6.023 x 10 (b) 3.45 x 10 (C) 6.02 x 10 (d) 3.8 x 10
  • 1 Answer(s)
  • 0 Likes
  • 2 Comments
  • Shares
  • Priyanshu kumar Best Answer
    For 21 option B is correct
    Likes(0) Reply(4)
    Priyanshu kumar
    see solution
    • cropped7221730498177025311.jpg
  • Priyanshu kumar
    For 20 Option C are correct
    Likes(0) Reply(3)
    Priyanshu kumar
    Option C is correct As they both depends on each other. The nature of alkali metal and the halogen both plays a equal parts in deciding the ionic radii