Potassium fluoride has NaCl type structure. What is the
distance between K⁺ and F⁻ ions if cell edge is ‘a’ cm.
(a) 2a cm (b) a/2 cm
(c) 4a cm (d) a/4 cm
Answers
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The distance between K⁺ and F⁻ ions is a/2 cm if cell edge is ‘a’ cm. That's why option b is correct.
Explanation:
The sodium chloride unit cell has face centered cubic (fcc) structure. Potassium fluoride also has fcc structure.
The distance between K⁺ and F⁻ is 1/2 × edge length.
If edge length is "a cm" then distance is a/2 cm
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