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Examples of Ionic Compounds

Potassium flu...

Question

Potassium fluoride has NaCl type structure. What is the distance (in cm) between $K^{+}$ and $F^{-}$ ions if cell edge is $a$ cm?

2 a

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\frac{a}{2}

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4 a

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\frac{a}{4}

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Solution

The correct option is A $\frac{a}{2}$
Potassium fluoride has NaCl-type structure.
The distance between $K^{+}$ and $F^{-}$ ions (if cell edge is $a$ cm) is $\frac{a}{2}$ cm.
Distance between $K^{+}$ and $F^{-} = \frac{1}{2} \times length of the edge = \frac{a}{2}$ cm

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