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[" 64.When heated above "916^(@)C" .iron...

[" 64.When heated above "916^(@)C" .iron changes in bec "],[" crystalline form to fec without the changes in the "],[" radius of atom.The ratio of density of the crystal "],[" before and after heating is :- "],[[" (1) "1.069," (2) "0.918],[" (3) "0.725," (4) "1.231]]

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