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[" Iron exhibits boc structure at room temperature,"],[" Above "900^(@)C" ,it transforms to foc 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) "],[[" (a) "(sqrt(3))/(sqrt(2))," (b) "(4sqrt(3))/(3sqrt(2))],[" (c) "(3sqrt(3))/(-sqrt(2))," (d) "(1)/(2)(NEET2018)]]

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