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Platinum crystallises in a face centered...

Platinum crystallises in a face centered cube crystal with a unit cell length of 3.9231 Å.The density and atomic radius of platinum are respectively . [Atomic mass of Pt=195]

A

`45.25g. cm^(-3), 2.516Å`

B

`21.86 g. cm^(-3), 1.387Å`

C

`29.46g.cm^(-3), 1.48Å`

D

None of these

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The correct Answer is:
B
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