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The ionic radii of Na^(+), K^(+) and Rb^...

The ionic radii of `Na^(+), K^(+)` and `Rb^(+)` are 97, 133 and 147 pm, respectively. Which of these ions will fit into the octachedral holes? (radius of `C_(60)^(3-)` is about 350 pm) 

A

`Na^(+)`

B

`K^(+)`

C

`Rb^(+)`

D

all of these

Text Solution

Verified by Experts

The correct Answer is:
C
For octahedral hole, the limiting radius ratio `r_(+)/r_(-) = 0.414, Rb^(+) = 147/350 = 0.414 = 0.42`
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