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CsCl crystallizes in a cubic lattice and...

CsCl crystallizes in a cubic lattice and has a `Cl^(-)` at each corner and `Cs^(+)` at the centre of unit cell. If `r_(Cs^(+))=1.69 Å` and `r_(Cl^(-))=1.81 Å`, what is the value of edge - length 'a' of the cube ? Compare this values of 'a' (calculated) from the observed density of CsCl. `3.97 gm//cm^(3). [M_((CsCl))=168.5]`

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Statement-1:For a CsCl unit cell r_(Cs)^+ + r_(Cl)^(-)=sqrt3/2 a where a is edge-length Statement-2: CsCl structure has FCC type unit-cell