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A solid `AB` has `CsCl`-type structure. The edge length of the unit cell is `404` pm. Calculate the distance of closest approach between `A^(o+)` and `B^(Θ)` ions.A. `4.0A^(0)`B. `6.4A^(0)`C. `3.5A^(0)`D. `7.0A^(0)` |
Answer» Correct Answer - 3 (A) Simple cubic and FC C have a=b=c, `alpha=beta=gamma=90^(@)` and belong to the same crystal system (cubic). (B) Cubic `(a=b=c,alpha=beta=gamma=90^(@))` Thombohedral `(a=b=c,alpha=beta=gammacancel=90^(@))`. These are two different crystal systems. (C) Cubic and tetragonal are two different crystal systems. (D) Hexagonal: `alpha=beta=90^(@)(gamma=120^(@))` Monoclinic : `alpha=gamma=90^(@)cancel=beta`, i.e., each has two crystallographic angles of `90^(@)`. Further, these are two different crystal systems. |
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