When heated above 916°C, iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio density of the crystal before heating and after heating is

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1.069

0.918

0.725

1.231

answer is B.

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Detailed Solution

ρ1=2×564r33;ρ2=4×56(22r)3ρ1ρ2⇒0.918

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