Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of

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Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc 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

TestHub · Accepted Answer

For BCC lattice: Z = 2 , a = 4 r 3 For FCC lattice: Z = 4 , a = 2 2 r Hence d 25 ° C d 900 ° C = Z M N A a 3 B C C Z M N A a 3 F C C = 2 4 2 2 r 4 r 3 3 = 3 3 4 2

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