1.

following is the fact about the newly discover superconductor fo C_(60) (fullerence).the alkali mental fulleride superconductor M_(3)C_(60)has a cubic closesr - packed (face0centered cubic) arrangement of nearly spherical C_(2-)^(60) anions with M^(+) cations in the holes between the larger C_(3-)^(60) ions, the holes are of two types - octahedral hoels , which are surrounded octachedralby six C_(3-)^(60) ions. tetarahedral holes , which are surrounded tetrahedrally by for C_(3-) ^(60) ions . the ionic radii of Na^(+), K^(+) and Rb^(+) are 97 , 133 and 147pm , respectivley . which of these ions will fit into the octanhedrral holes ? (radius of C_(3-)^(60) is about 350 pm )

Answer»

`NA^(+)`
`K^(+)`
`RB^(+)`
all of these

Answer :C


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