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Iron exhibits bcc structure at room temp...

Iron exhibits bcc structure at room tempera­ture. Above `900^(@)`C, it transforms to fee structure. The ratio of density of iron at room temperature to that at `900^(@)`C (assuming molar mass and atomic radii of iron remains constant with temperature) is

A

`(3sqrt(2))/(4sqrt(2))`

B

`(4sqrt(3))/(3sqrt(2))`

C

`sqrt(3)/sqrt(2)`

D

`1/2`

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The correct Answer is:
A
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