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Lead (II) sulphide crystal has NaCl str...

Lead (II) sulphide crystal has NaCl structure. What is the distance betweeen `Pd^(2+) and S^(2-)` in PhS if its density is ` 12.7 " g cm^(-3)` ? (At .mass of Pb = 207)

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The correct Answer is:
250 pm
Distance between `Pb^(2+)` and `S^(2-)` ions =`a/2` (as it has NaCl structure)
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