Question

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

• A. $\frac{\sqrt3}{\sqrt2}$
• B. $\frac{3\sqrt3}{4\sqrt2}$
• C. $\frac{4\sqrt3}{3\sqrt2}$
• D. $\frac{1}{2}$

Answer 1

Answer: (B)

$\frac{3\sqrt3}{4\sqrt2}$

Answer 2

The correct option is (B) :$\frac{3\sqrt3}{4\sqrt2}$.