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KF has NaCl structure. The edge length o...

KF has NaCl structure. The edge length of its unit cell has been found to be 537.6 pm. The distance between `K^(+)` and `F^(-)` in KF is `:`

A

537.6pm

B

268.8pm

C

1075.2pm

D

cannot be calculated

Text Solution

Verified by Experts

The correct Answer is:
B
In KF, edge length is equal to `2(r_(K^(+))+r_(F^(-)))` so that,
`r_(K^(+))+r_(F^(-))= ( 537)/( 2) = 268.8`pm
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Knowledge Check

  • The edge length of NaCl unit cell is 564 pm. The density of NaCl in gcm^-3 is

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